Stick with Fedora and Nobara, they are good distros. I use Arch myself, because I like that bleeding edge, bro - but if those other distros are working for you, there’s pretty much no reason for the average person to switch.
Yes, Real Debrid (RD) functions as a leech. However, in essence, RD typically only needs to leech once for widely sought-after content, storing it in a cache for quick access by any RD user.
In the worst case, RD may need to acquire less popular content through a few hit-and-run instances. RD actually contributes to minimizing leeching - if each RD user torrented independently on public trackers without seeding, the situation would be more problematic.
Calories burned from running isn’t that great of a return.
An estimate is that a 200 pound person burns 792 calories per hour running at 5mph (12min/mile, or 8kph) on a firm, level surface. A 140 pound person burns 555 calories in the same scenario.