Do you just pick a fake name and go to mail.proton.com to make an account?  Yep.  Can people email you?  Yep.  Does it cost anything?  Nope.  Is the point that it would be undetectable?  Not linked to your personal account and can be used to "verify" you to these websites.  Is this what you do when signing up for sites that require email?  Yep.  I am sorry to be such a dolt, but I know NOTHING about this and you are the only people that even suggest this.  I don't expect someone that hasn't encountered this issue/situation to know exactly what's going on.  All good questions.  Thanks in advance.  Cheers