US and EU law already cover this: undisclosed paid promotion that looks like neutral content is generally illegal (FTC Act + Endorsement Guides in the US, UCPD + DSA in the EU). Product placement in old TV/film is the historical exception, not the rule. An interactive "assistant" secretly steering you because someone paid for it is legally much closer to a deceptive influencer ad than to a Snapple bottle in Seinfeld.
