It's exactly because there are laws against deceptive advertising that Mamdani can enact theses rules.

NYC's Administrative Code prohibits deceptive trade practices, false advertising, misleading representations made to customers, etc. It gives the NYC Department of Consumer and Worker Protection authority to execute those broad guidelines by enacting specific rules.

So Mamdani and the DCWP are basically saying, "City law gives us the authority to regulate this sort of thing, and because this is clearly in violation, here are the specific rules we're enacting to regulate it."

This makes sense. So my two questions are the answer to each other. Interesting.

Thanks for that clarification. I was scouring the article and this comment section for some sort of clarification on how this would be enforced, since nowhere does it say that a new law was being passed or something.