... and the personal data on how much time you spend in which game, whether those are day times or night, whether it's regualr or irregular etc. from which different information on your situation an be derived.

If it's connected to your desktop, it can also use all the dark patterns Facebook knows to tie it to your other activities ...

Put in a data information request and see what they do actually know about you.

May well be insightful. Friends who have your email and phone number in a contact entry who also have FB and synced contacts - etc etc etc. May well have more information than just an email address and way to look at it is - would you bet a large sum of money that is all they have? Always a good way of putting perspective upon things I find.

I did this. Then one day, facebook locked me out of my account unless I sent them a picture of my driving licence.

Isn't it against Facebook TOS to have more than one Facebook account, or to open a Facebook account for someone/thing that isn't a real person?

I have a bridge I'd like to sell you then.