[faeyanpiraat]

Yes, they make registering burner addresses a breeze for potentially spammy sites, but thats basically their only USP for me.

[decrypt]

I don't understand this part. ProtonMail does not offer a burner address service. Are you referring to the ability to create aliases on a ProtonMail account? If you are, that's possible with most other hosts too.

A proper burner address service would be SimpleLogin or Anonaddy.