Browsers are always going to be "as-is, best effort" . No one, not even google is going to stick out their neck and protect your privacy, that's up to you, and

Browsers are always going to be "as-is, best effort" . No one, not even google is going to stick out their neck and protect your privacy, that's up to you, and especially not "legally" as that has aspects of easily being sued when privacy/money is involved. Certainly not for a "small monthly fee". Best you're going to get is open source and security community scrutiny of said open source code