I'm a bit biased as I started with Jellyfin, but the Roku Jellyfin app works flawlessly on the family TV.
I'd advise at least becoming mildly familiar with how you'd go about it, since corpos suddenly rug-pulling existing users and forcing subscriptions is pretty common, basically expected, behavior of American business now.
That way you have an "out" and your service can have minimal downtime. :)
On the other hand, you might just find you like how sleek and functional Jellyfin is. I can only see wins for you here. :p