Comment by pkulak
4 years ago
Private keys are cheap to make. There's no reason you couldn't have a different one for every site. Of course, then it's on you to keep track of them, but it's already on you to keep track of the credentials you're using now. At least this way, the default of "use the same creds everywhere" is secure, if not more private.
This is already solved by existing crypto wallet tooling too, you can create an infinite number of keys all derived from a single root key (usually a 12-20 word phrase in modern wallets). A service with access to a single child public or even private key can't tie them to the sibling keys.