"There's no reason to ever have anything non-open in your FOSS project's infrastructure."

Except, that it is easier to set up? What you describe sounds reasonable. But someone needs to set all that up and host it and needs to be trusted etc.

So I guess if many people get involved and do set this up, they would convince the rest of the team to join them. But right now it is just a demand for more work for them.

If I had a serious interest in the project (more than, say, maybe sending a patch here and there to fix my pet peeve), I would definitely volunteer for something like that if there was a demand. That's something I quite enjoy, and am reasonably good at, I think.

And as for me being there for years to come, who can say that for sure? I would absolutely try to. For that matter, will Discord still be here next year?