This makes me 😭
UPDATE: Thanks @nekusoul@lemmy.nekusoul.de for this update: The issue has now been commented on and was closed by the maintainer, where they explained why those blocks would be nonsense. But it appears the OP wants to still talk with maintainer privately about it.
Using a simplemail means you are bound to a provider, in this case ProtonMail.If you setup a custom domain you can ditch ProtonMail/Simplelogin duo domains and switch to a different provider whenever you want.
Oh yeah, this makes absolutely sense. I do use simplelogin only for things I don’t really care about, but it is definitely a good point what you are saying.