Data brokers listen to everything, track your movements, buying habits, internet history, apps, app usage, buying habits, etc.

Terms of service are meaningless if they keep the extent as secret as possible. Facebook has demonstrably shown this and as shocking as it is they are restrained compared to lots of companies.

Especially when you can out source the full evil to a wholly owned subsidiary for plausible deniability.

And if private corpse know something, many foreign governments know all of it.