[newjersey]

I'd spin this the other way round, even in the US it is unlawful to not disclose that you are advertising:

From your link:

> In the U.S., the Federal Trade Commission said in 2017 that influencers on social media sites such as Twitter and Instagram “should clearly and conspicuously disclose” any paid work to promote a product or service.

Sponsored posts should be clearly labeled, at the very least

[nerdponx]

Anecdotally, the "conspicuously" provision is not enforced, and the FTC no longer has any contact/reporting channel for regular citizens to report violations, other than the specific case of being scammed.