#Facebook on why they track users across the web:

https://newsroom.fb.com/news/2018/04/data-off-facebook/

Translation: "Everyone else does it too, so it's okay."

And trying to lead the user to believe that they really do need all of this stuff. Do they "need" it to provide those services? Perhaps. Do they "need" to provide these services to millions of people that don't want, have never asked for, or are completely unaware of them? I think not.