I moved over to TabloTV about 8 or 9 years ago. I got tied of fixing stuff when I would update something and Tablo just worked on the Roku without much fuss.
I’m still happy with and love the Tablo, but it’s no better than MythTV was, just easier to maintain.
We use Alma, which is basically Rocky. Before that, CentOS. Lots of people don’t need or want the expensive support contracts.
OSS support though donations and commits is the way to go unless you get value out of those contracts (we would not).