Also remember "git" is decentralized itself, you're supposed to have your git repo locally too, if PR's, or issues or comments are "alpha" your code shouldn't be affected by it at all
Im personally down to try alpha software usually, i just havent found the need to retrain all my muscle memory to not use GH yet, as much as I hate it's owned by microsoft nowadays.
They also do offer pretty good "free tier" services for CI via Actions that otherwise you'd need to pay yourself
If I'm working in software development, the last thing I want to do is trust my coding workflow to an alpha-state platform.