It's strange to me that a group of people that is sometimes stereotyped as being too preoccupied with logical fallacies will still invoke slippery slopes. Making good decisions now does not remove our capability to make good decisions in the future. Nor is it particularly reasonable to draw parallels between "don't fake users to befriend key targets" and "we may as well ban alcohol".

The status quo isn't as black and white as you've made it out. Advertisements and marketing have developed along with their regulations throughout modern history. Most countries restrict advertisements for prescription medicines. Many restrict advertising aimed at children directly. In the US, advertising is explicitly excluded from the first amendment.

A free market works only when people act rationally. That's one of the underlying hypotheses. Psychological manipulation and the Zynga Skinner box causes people to act out of alignment with their rational preferences.