Preface: I appreciate the sentiment, fuck Microsoft.
Projects typically aren't "hosted" on code repositories like GitHub.
Because the underlying version control technology, git, is meant to be distributed - it's super weird to draw that line in the sand. It's like saying "show me TXT files written with SublimeText, I hate Notepad++!"
I get that you might want to, like, judge a developer for using github? But, like... features are features. Build minutes are build minutes. If you fork a repo and use GitLab to manage it, does that make the project better?
Actually, you can send the diff patches by email/ pastebin/ gitlab/ etc. It's up to the main developer to take your contribution seriously, given the level of annoyance you might be presenting. Same happens in the other direction, you can host your code on sourcehut, but many junior devs could be repelled by the old school ux.
Issues, milestones, discussions, pull requests, build logs, they all stay on the chosen host. That host can then add specific conditions to creating accounts, or participating in the discussion, searching code etc. Such as force you to have a phone number in your account, otherwise you won't be able to comment on issues. And all of these things might be locked in without a way to export and migrate to another host, so yes, it definitely matters where the project is hosted.
It would be nice if platforms like Forgejo and gitlab could hook into some sort of review and issue tracking protocol that was built directly into git, like git-appraise. Unfortunately it doesn't look like git appraise is actively developed.
Forgejo itself is hosted on Codeberg, dogfooding itself Foot terminal emulator Tenacity Audacity fork xmobar status bar written in (and configured in) Haskell Redox Unix-like OS written in Rust RISC OS Open the original ARM OS, still seeing active development
"I hate Instagram tell me about popular celebrities using their own site/ Twitter/ Mastodon"... I think it's putting the horses behind the cart. You want to use some code or look to a celeb pics? Then do it on wherever those stories were posted.
I wish the were a massive uptake of forgejo just to get federation of sourceforges implemented. Alternative sourceforges really need to band together because creating an account on every instance is an absolute no-go.