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