at this point one should just assume all their data is already public once they entered it to any platform...

Given how willing basically every major company is to sell your data to make money this is basically already the case and has been for years.

And when governments try to plug up some of the loopholes when it comes to privacy and data sharing, every major company finds some new gap to exploit or just does it illegally without telling anybody until they get found out and pay the fine.