You are correct that Email is not private. However, this is more of a power issue, as many services won’t let you just do a password, and demand this non-private email. Including many custodial bitcoin wallets which are really bank accounts.
And you got a link on Proton doing whirlpool?
Still marked as TBD, like the wallet and many features in it
https://m.primal.net/JeiY.jpg
interesting. I have serious doubts on them doing whirlpools. I'd be willing to bet you on that they will suck or won't come out