I see your point, but couldn’t you say the same thing about any forum?

“What happens when the forum shuts down? All threads discussing issues gone forever”

I use Vikunja, but you have to self host it, it’s not an app you can just start on your PC

It’s great to use open source software. But once you need to use CAD for work, you’re gonna use the most efficient tool you can find no matter what OS it requires.