[lukeify]

Within the space of 2 weeks I had both Etsy and Mapbox block signups with Proton Mail aliases. The practice is rapidly becoming more common.

[bigstrat2003]

Blocking signups from proton.me is not the same thing as only allowing signups from the big mail providers.

[lukeify]

Great, so all I need to do is to authoritatively check each plausible combination of domains that _might_ work and rule each of them out before I can make my claim, according to you?

What a load of pedantry.