That is why getting as much on blockchains is crucial. As for the cookies and things, individual websites is actually spreading the data out. That said, it is what is in the hands of Big Tech such as Google, Amazon, Microsoft, Meta, X, and a few others.
Those are the ones to watch out for. British Telecom is not much of a threat even though they have all that is on ones phone.
I used to believe that Musk was going to do things differently with X after all the rave he made when he started buying a lot of cryptocurrency...