The question is whether we should hold them legally accountable to have that knowledge (or at least having done some basic research). In some sense, being a brand ambassador is to lend your credibility and honor to a product. Whether society is better or worse is an open question, as there would be pretty obvious workarounds and it might just add noise to the regulations.
I do think people should be generally accountable for what they promote. Otherwise there is an open loop, where individuals and companies can get the upside without a corresponding downside of accountability. That inherently unbalanced the scales, which is a bad incentive.
I do think people should be generally accountable for what they promote. Otherwise there is an open loop, where individuals and companies can get the upside without a corresponding downside of accountability. That inherently unbalanced the scales, which is a bad incentive.