Maybe unpopular opinion, but I worked at "mega-coorporations" and nobody cares what you buy. You are just a number in a system that at most uses your buying history to suggest you books to buy.
So they do care and intend to use the information to practice psychological tricks and deception to make me buy more things (probably not just books) and also sell it to others who want to do the same. No thanks!
I rather have targeted adds of things that I might need than porn and poker adds.
1. No recommendations
2. Generic recommendations
3. Tailored recommendations
4. Paid ads
I’ll always use an ad blocker to aim for (1) anyway, but shouldn’t have to rely on that.
There you have it. And beyond that, the corporation will sell the data to whoever if profitable. They will abuse them any time there is anything to gain.
They won't sell it because it is their advantage.