And if they are broken up, now you’re in 5 companies’ databases, win?

And then they are all probably going to implement “sign in with Google”.

>And if they are broken up, now you’re in 5 companies’ databases, win?

Yes, win. I'd rather be in a number of smaller businesses database than in the one last company's.

Isn’t that the opposite of privacy?

The opposite of privacy in this context is 1 or more companies having your data. Note the 1.