@itsfoss@mastodon.social worth noting that this feature is just SimpleLogin.io integrated in proton pass.
You can still buy and use it independently from Proton Pass. It's nice to see that Pass users get SimpleLogin for free, but I prefer to manage my mail aliases outside proton pass (as I already use a different password manager)
Another service offering the same features is Addy.io, which you can get it for 1โฌ/month.