Kyoto project is moving from GitHub to Sourcehut 4 years ago
Can't speak for others but I would choose sourcehut over gitlab any day; having used gitlab at work, it's a hot mess of JavaScript that tries to replace command line workflows that work-- it's terribly slow, and once even used 60GB of memory on my machine.
On the other hand, sourcehut promotes better workflows, in favor of a really snappy web interface.
For those who are attached to forks and PRs there's also a web UI for submitting a "patch set" which basically walks you through the process the same way as a pull request.