I think the theme you and other posters are stating in various ways, is that being expised to persuasion always has negative value. The motivation for some actors can be good, but it will never be universal. When seeking out information to make a purchase, one of the primary taks is to identify and filter out persuasion in the process, in the form of sponsored listings, or reddit shills. I have seen calls to ban paid persuasion, or even all paid speech. I don't know if that is compatible with the notion of free speech, or if I agree it is a good idea, but it certainly would have some good effects in addition to any bad ones.

I feel like it's happened to me multiple times that I've seen an ad for something I actually want, but if I click through or look up the company advertised, then do a little research on that company, I discover that it's a scam or a super crappy version, then I actually purchase the thing from a more reputable company with higher quality. So I guess they succeeded in getting me to buy something, from their competitors.