Whether that's a risk people are willing to take is another question.
Since Jira is entirely development tools, it sees no benefit to being hosted offsite.
(We're a 1-dev startup so YMMV)
That's also the basis for the cross-org reporting that makes the MBA types happy. Yes, you can debate the usefulness, but that's who is signing the checks.
As a long time user of both, I'm much happier with Gitlab, but manager-types still struggle a bit, because too much technical clutter in their UI (they just want issues/boards, not CI/CD).
I got used to less features, and kind of see it as a benefit. We tend to push a product to its limits, then throw it out the window when it becomes to complex.
It still has many positives as an alternative to GitHub that also happens to be open source, of course.
https://fossil-scm.org/home/doc/trunk/www/index.wiki
Before the JIRA days there was https://www.redmine.org/ as well.
The downside is that DC is about twice as expensive.
If you're using any paid add ons, you'll probably need to pay more for them as well.
It turns it really expensive if you've only got 50 people. I can't see many businesses that size being very excited.