Imho the main argument for github is that it lowers the hurdle for new ane ad-hoc contributions like issues.
I'm problably too lazy to registsr a new account for your instance just to open a bug report.
In my opinion that sounds like a plus. People that are too lazy to register an account to put in a code merge request or report a bug aren't going to be writing quality code or quality bug reports.
Working in a busy codebase for a long time when I have to spend time a non-trivial amount of time triaging through tickets I can't reproduce that is taking time away from legitimate bug and request tickets I can be working on. It can seriously lead to burnout.
You don't have to fix every issue, there are also other volunteers who might look at it.
If the reproducible instructions aren't clear enough or are missing, just ask for more info. If they can't deliver on that, close it or just move on and other people might take care of it
Why would anyone self-host a FLOSS project? Trade secrets is not a concern, nor is it barring access to the source code repository. Why would anyone waste their resources managing a service that adds no value beyond a third-party service like GitHub?
So Microsoft has access to Firefox's source code. So what? Isn't the point of a FLOSS project that your source code should be made available to everyone?
Because while you do have control (and "copies") of the source code repository, that's not really true for the ecosystem around it - tickets, pull requests, ...
If Microsoft decided to fuck you over you'd have a hard time migrating the "community" around that source code somewhere else.
Obviously depends on what features you are using, but for example losing all tickets would be problematic for any projects.
Apparently Mozilla won't be even accepting PRs there so it doesn't matter much.
Because while you do have control (and “copies”) of the source code repository, that’s not really true for the ecosystem around it - tickets, pull requests, …
The announcement to drop Mercurial quite clearly states that their workflow won't change and that GitHub pull requests are not considered a part of their workflow.
Also, that's entirely irrelevant to start with. Either you care about software freedom and software quality, or you don't. If you care about software freedom you care about having free and unrestricted access to FLOSS projects such as Firefox, which GitHub clearly provides. If you care about software quality you'd care about the Firefox team picking the absolute best tools for the job that they themselves picked.
I keep hearing people only on Lemmy bring up Gitea but I haven't really heard of it otherwise. What's the appeal and what's keeping it locked away with the Lemmy community?