While I'm a vocal critic of both Facebook and Google, do they really make people buy things they don't need by manipulating?
Anecdotally, most of the marketing material and discounts that people around me get and then use to make a purchasing decision came from email. Not Google or Facebook shoving shit in their face, plain old email. Are you going to call for a ban on email?
The times I've been convinced to check out a product were only because either a.) their product was really good in the ad and b.) the ad was really good. For example, I still show that Honda R button ad to people who haven't seen it. And even though that ad was still brilliant, as I type this, my Google query (to reconfirm) was "Hyundai R button ad". That's right - that unique and famous YouTube ad that I still remember from 2015 was still not enough for me to even remember the name of the company, much less the name of the product!
Most ads are obnoxious and/or boring, and simply exasperating when they interrupt you in between, but nowhere near manipulative. Facebook and Google's major flaw is not in the advertising model but in the way they amplify voices of like minded people who are otherwise irrelevant personae.