For a while now I've been dual hosting my projects on both Github and Codeberg and adding a note in the README's [1] explaining the situation. I donate to Codeberg and run my own self-hosted forgejo runners for actions, and maintain much of my testing on both platforms.
I push to Github and then an Action mirrors the code to Codeberg automatically.
I'd fully switch over except practically everybody is on Github and nobody is on Codeberg, and I've had more outages with Codeberg than Github over the past year.
It really feels like there could be some good tooling in this area to make working through multiple Forge's easier and not force things to be centralized so much. Hopefully more projects moving out of Github makes it easier and gets more people contributing elsewhere.