This repository contains a comprehensive list of 117.981 free and disposable email providers
ProtonMail.com is a free email provider. Why would it not be on a list that contains free email providers? Gmail.com and Outlook.com are also on here, because they are also free email providers.
I love how the GitHub issue asking for ProtonMail's domains to be removed is entirely about how Gmail, Outlook, iCloud, and Yahoo provide anonymous emails too and shouldn't they be on the list if ProtonMail is... and they are. Someone is just checking lists for ProtonMail's domains and not actually modifying their copypaste issue or doing any kind of research into the list/repo they're posting to.
I don't think every list of disposable email providers that incorrectly includes ProtonMail deserves a post to [email protected]. Lists that are widely used deserve that kind of attention, but this has two stars on Github.
As BombOmOm points out, this list includes free email providers and the inclusion of ProtonMail is correct.
It's a list of places you can get free, disposable email addresses. Protonmail fits here. Now, why anybody would use this list for mail filtering is a whole different question. They'd be blocking some huge email providers.
This is the second thread I've seen like this recently. Proton made a properly labeled throwaway github user to open issues on every repo with anti-abuse lists that contained their domains a few weeks ago. Now different throwaway users are opening new issues for the repos that declined to remove them and then posting to social media trying to rile up an outrage mob to flood the issues. Seems super sketch. Yet another reason to stay away from everything proton.