Do they? I'd wager Google knows a great deal more about me than Facebook.

Maybe.

In that case I must be a very special case or they are absolutely clueless or something.

I see nothing but idiotic ideas coming out from Googles knowledge of my data:

- absurdly irrelevant and even insulting ads. I can easily count on one hand the useful ones I have got (one for a local shop and one for Jetbrains products I think).

- Google Now suggesting in the middle of the night that I should text the boss two levels above me or call a random girl I once helped with a computer(!)

Same. I think these AI companies make too many assumptions on what people want and need. It's like people are lab mice they watch in terms of some experiment, but don't communicate with beside asking to name interests like technology or cryptocurrency and rate the quality of the call.

I agree in some respects. It's hard to leave Google and Facebook because their accounts are used to login to other sites and services. Also when you buy apps and switch mobile OS you don't have a right for a free copy of this app from a different store, i.e. not real ownership because your app is tethered to the store.