Lack of ability for companies to advertise to you seems like a distinct concern from that of how much information they have about you, let's take it one at a time!

> Lack of ability for companies to advertise to you seems like a distinct concern

It's not about "lack of ability to advertise", it's about someone being able to heavily manipulate the perceived availability of competition (which is much more important than the real availability of competition). And that someone is the same someone that helps the companies manipulate the price (hint: it's Google).