Care to elaborate on the GitHub python issues for someone not totally in the loop? Thanks!
The issues, wiki, CI, and user-ecosystem of github aren't portable. If Github shut down, changed their policies, or just simply did something you don't like, you have no recourse if you bond your software to their platform.
If you use gitlab, phabricator, gogs, or any other open source solution, either you are hosting it yourself - everyone wins - or you are using a centralized host equivalent to github, except now if they pull the rug out from under you you still have all the open source releases up to that point that you can pivot to - and you wouldn't necessarily need to self host, because someone will pick up the reins.
This is not in GitLab yet. What is in Gitlab is a way to export your projects including all the issues so you can import them on a self hosted server without losing fidelity. But that doesn't change the day to day workflow.