You picked one concern of multiple: Code discoverability of an already known project.
Multiple times I have found project sources on their own platforms, and when I would have contributed tickets or code, I did not because of requiring yet another account on yet another platform, with whatever yet unknown signup workflow.
And there is man other concerns, some of which the comment you are replied to mentioned.
https://github.com/doitsujin/dxvk/releases/tag/v2.5.3