This doesn't work in practice. That's not really how OSS works; it's a naive interpretation. I can go into details if you'd like, but first: Have you taken this approach before? What were the results? I find it usually ends up in discussions/arguments with the owners, and it doesn't get merged. And I see the other side too; reviewing PRs is a burden, and the submitters often will fix their own problem, while introducing complexity or problems elsewhere. Also, it's generally MUCH easier for a maintainer/owner to update software than a rando who wants a bug fixed.

I fix it for myself, share it upstream, and have no fucks to give if the gatekeepers review it, reject it, merge it, or belch any purity bullshit in between.

The beauty of OSS is that you don't need permission from anyone to modify the code to your own needs.