Hide-my-emails keep working after you leave proton if you have your own domain. I left proton last year and the alias I created there still point to my email address. But you have to have it point to a custom domain email address

I moved from Tuta because encryption makes it real slow, but the biggest reason was that searching in mails is very painful, ineffective, in addition to slow. So I decided to ditch the whole end-to-end encryption thing for mail considering all I've read about that recently.

Since I've moved, I could re-browse all my emails and realized 80 % of them are very un-sensitive data like order confirmations etc Since I selfhost paperless, which is awesome, I really don't need to keep a record of more important stuff in my mails anymore

I just moved from Tuta to mailo for their free account. So far, it looks fine and simple. The custom domain config was not so straightforward, but finally ok. I find that their documentation could be improved, honestly.