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.
Github is unfortunately the premier platform for collaborating with others to build FOSS. Until alternative forges support federation, any other forge is usually a dead end.
'premier'
The pull request model Microsoft GitHub force on users ends up being a colossal waste of everyone’s time & it’s the only model offered. It’s also a social media platform which encourages star hacking, READMEs that are actually RENDERMEs, focusing too much on making ones graph green, etc. that are bad for project quality & mental health IMO. This doesn’t sound like a “premier” platform but the result of lock-in & network effect. The way to break is to go host elsewhere… & since Git is a distributed version control system, this should be encouraged.