[andrepd]

>At least review sites would be something that a user would have to seek out, rather than having the information blasted into their field of attention at times the advertisers found strategically optimal.

This is the crux of the question. I don't consent to any of it, but just walking down the streets I'm targeted by an assault on my brain from every direction. Ditto picking up my phone or browsing the web (were it not for uBlock). It's not ethical.

As for review sites being shilled, mandate big disclaimers detailing sponsors (shill praising product X would have to have a big banner saying "this content paid for by X", as its already done in other contexts). Reputation would eventually form around trusted reviwers.