Github dislikes email “aliases” so much that they will shadow ban your otherwise normal activities for months, and once flagged, support will request not only a “valid” email domain but also that you remove the “alias” email from the account completely.
Yeah, they’re gatekeepers. We know. Even EU regulators have noticed and are finally making baby steps on cracking down on them.
Though just as with Twitter and Reddit, we need a resilient decentral OSS alternative for this to work. That’s in the works as we speak but it’s not here yet. It’s like trying to give up Reddit 3 years a go; there was no viable alternative.