Zig is moving to this direction is well.
That is the opposite of what's going on, read this https://kristoff.it/blog/contributor-poker-and-ai/
Now that I think about it, moving away from GitHub surely filtered many low-quality contributions fueled by clout/GH profile reputation.
Indeed, while there is communication that the situation with merging external pull requests should improve, the reality is that it's easier to land a patch in Linux, than in Zig.