Why AI marketing tools keep writing things that get NZ businesses fined

The promise of AI marketing tools is real. You paste your website, tell it what you’re promoting, and 90 seconds later you have an Instagram caption, a Facebook post, a customer email, and a Google ad. For a one-person café or sole-trader plumber in NZ, this is genuinely transformative.

But here’s the part nobody’s saying loudly: most of what these AI tools generate would not survive a Fair Trading Act 1986 audit. And the Commerce Commission has been quietly busy. In recent decisions, NZ businesses have copped six-figure fines for ad copy that contained exactly the kind of phrasing GPT-4o or generic Claude wrappers will happily produce on request.

Why generic AI writes risky claims by default

Modern large language models are trained predominantly on US web content. American marketing language is aggressively claim-heavy: “Best in the city,” “Fully licensed,” “Only 3 spots left,” “Guaranteed satisfaction.” In the US, the regulatory penalty for unverifiable superlatives is real but rarely enforced. In NZ and AU, it’s both real and actively enforced.

So when you ask a generic AI tool to write a caption for your Mt Eden plumbing business, it draws on patterns it learned from tens of millions of American plumbing pages — and gives you copy that would be perfectly legal in Houston and a Fair Trading problem in Auckland.

The four claims that quietly create legal risk

From watching how AI tools generate marketing copy for small businesses, four claim patterns appear over and over — and all four are flagged in the Fair Trading Act and the Australian Consumer Law’s misleading-conduct provisions:

1. Unverifiable superlatives. “Best café in Ponsonby,” “Auckland’s top tradies.” Section 9 of the Fair Trading Act prohibits misleading and deceptive conduct. If you can’t produce independent evidence that you’re the “best,” you can’t legally claim it.
2. Licensing or registration claims you don’t hold. “Fully licensed electrician,” “Registered builder.” In NZ, regulated trades (electrical, gas, drainlaying, plumbing) require active EWRB or PGDB registration. Australia is the same with state regulators (VBA, QBCC, etc.). Saying it without holding it is a Section 13 false representation.
3. Fake scarcity and urgency. “Only 3 spots left this week,” “Book before midnight to lock in this price.” If the scarcity is invented (and AI loves to invent it), you’re creating false urgency, which is specifically called out under the FTA.
4. Workmanship and outcome guarantees you can’t honour. “100% satisfaction guaranteed,” “Lifetime warranty.” Generic AI will write these without checking. The Consumer Guarantees Act overrides anything you advertise — promising more than the law gives the customer creates explicit risk if you can’t back it up.

What a compliance-aware AI does differently

Building an AI marketing tool that actually understands AU/NZ advertising law is not a matter of bolting a disclaimer onto the output. It requires two things working together:

1. A separate compliance layer. The same AI that generates copy cannot reliably judge whether that copy is legally safe — it’s the same model evaluating its own output. Marlaio runs every draft through a separate check using a different model (Claude Opus or Sonnet), with a prompt specifically tuned against the Fair Trading Act and Australian Consumer Law. If a draft says “fully licensed” and the source facts don’t support it, the draft is refused before you ever see it.

2. A source-of-truth lock. Every claim in the draft has to be traceable to something the business owner actually told us, or something Marlaio pulled from your verified public sources (Google Places, your website). If you didn’t say you’re EWRB-registered, the AI cannot generate copy that implies you are. If you didn’t tell us there are exactly 3 spots left, no “Only 3 left” line will appear.

This is harder to build than the generation itself. But for an NZ small business, it’s the actual product. The generation you can get from any AI tool. The protection against accidentally running a Fair Trading violation in your Facebook ads — that’s where the real value lives.

What this looks like in practice

A real example from a test run. A Mt Eden plumbing business asked Marlaio to write an Instagram caption to drive emergency callouts. The first draft included “Fully licensed plumber in Auckland — 12 years local — guaranteed same-day service.”

The compliance layer flagged three issues before the customer saw the draft:

• “Fully licensed” — not in the source facts the owner provided. Replaced with “your local plumber.”
• “Auckland” — broader than the suburbs the owner actually services (Mt Eden, Mt Albert, Sandringham). Replaced with the specific suburb list.
• “Guaranteed same-day service” — an outcome guarantee with no terms. Replaced with “after-hours by arrangement.”

Same useful caption. Same NZ tradie tone. Three legal landmines removed before the owner had to think about it.

The bottom line for NZ small businesses

AI marketing tools are not going away — they’re going to keep getting better at writing, faster, and cheaper. But the single biggest gap between a tool you can use safely and a tool that quietly creates legal liability is not the writing quality. It’s the compliance layer underneath.

When you’re evaluating an AI marketing tool for your NZ business, three questions matter more than “how good is the writing”:

1. Does it refuse to generate claims that aren’t in my source facts?
2. Does it understand NZ Fair Trading Act and Australian Consumer Law specifically — not just “general best practices”?
3. Does it use a separate compliance check, or just hope the generation model self-polices?

Most tools will struggle with all three. That’s the gap Marlaio was built into.

This article is general information about NZ Fair Trading Act 1986 and Australian Consumer Law as they apply to small-business marketing. It is not legal advice. If you’re uncertain whether a specific claim in your marketing is safe, talk to a commercial lawyer or contact the Commerce Commission directly.