Dumb question, but why are people so surprised by this? Can you honestly say at this point in the game that you had no idea this was happening or that this is news to you?
One simple answer is that marketing (a.k.a. thought manipulation) works. Propaganda works.
What's the advertisement/marketing spending for all these surveillance companies' products in the past 10 years?
And, in comparison, what about the advertising spending for consumer awareness of privacy respect and personal information security?
Combine that lopsided-ness with the general person's lack of technical/surveillance education and it's more understandable why people aren't rejecting these companies' creepy behaviour.