Moreover you can use this website (it generates temporary working Gmail addresses) or this website where is new domain name every day

You can try by yourself (without “grey” ip)

Unfortunately, I contacted support of some local websites, and they said that they wouldn’t white list any domains and I need to contact this list owner

Yes. Aliases is not disposable mails. Moreover SimpleLogin (Proton aliasing service) forbids to use it as disposable in ToS

You can sign up on Outlook anonymously too. Look video in this comment

He thinks that it is because of anonymous registration. But Outlook provides it too…

That’s why I posted this. I hope we will find a way to unblock Proton

Also this list blocks it too https://github.com/wesbos/burner-email-providers/issues/422

Please help!

But inclusion of Proton domains makes many Proton users to be unable to register on websites. It is only helping google to keep monopoly and it is simply privacy harming