100X
"The problem with e2ee messaging services is that you are completely locked into that service. Signal messages cannot be sent to users who do not have Signal."
That is what makes it so secure, each person is at a similar level of security/privacy. So the system works.
"Tuta have aliases"
Yes they do...
try this, when logging in to Tuta,
just choose one of your alias address not your real address and use your current password and you will find that you log into your email account, that alias leads right back to your inbox....
So if you use up all 15 aliases, your email account now has 16 current usernames, not one.
I used Tuta, but left for something better,
My current username to log into my email was composed by a password generator and is not an email address.