GitLab and Codeberg can absolutely become trash, each in their own way.
The solution isn't just "migrating off of GitHub"; it's "migrating to a platform that is unownable by design, not only hope".
And there are no good enough decentralized alternatives to GitHub yet.
Tangled.org's decentralization has serious holes. Radicle made an alien universe; a niche within a niche. Also, it's already having problems with ISPs: https://radicle.dev/2026/04/23/domain-move