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openpgp web key directory exists and should work but I don't know if many email providers support or use it

Skiff says they encrypt email subjects while protonmail does not. I cannot determine from browsing if they encrypt the sender and receiver addresses.

Skiff's free tier also has a 'generous' free tier with 4 aliases, 10GB of drive (only? combined with email?) storage, and custom domain support (? !)

Sure, for sending/receiving the email all of that is accessible/needed but some (all, even) of this could be stored encrypted by the user's password/mailbox-password.

If I remember correctly: one of the reasons they don't encrypt that metadata is so they can do the search box server-side.

If you are paying for Pass Plus or Proton Unlimited then you have integrated 2FA/TOTP which Bitwarden also makes you pay for, same with Yubikey/FIDO2/etc 2-step login, which I think is possible for signing into proton pass. And no desktop app for proton pass, maybe some day though?

You might be thinking of https://encryp.ch/blog/disturbing-facts-about-protonmail/

edit: I'd like to inject a reminder that protonmail doesn't encrypt all of your mailbox contents. From their privacy policy:

"we have access to the following email metadata: sender and recipient email addresses, the IP address incoming messages originated from, attachment name, message subject, and message sent and received times"

I’m more interested in the original registrar (and ICANN?) of bitcoin.org having a name and payment that likely links directly to Satoshi. I would be amazed if nobody / nogovernment has looked at that information.

Ha, you got me. I was about leave instead of saying how whatever comment I make has generally been commented already

It hasn’t rolled out to all users yet

ISNIC doesn't require domestic NS providers. They do require the nameservers to register a contact though. https://www.isnic.is/en/domain/req#req-hosts