Don’t want to say the exact gym because it’s a local chain but they used a software suite called “ABC Fitness”
Quote from their website
Imagine running a fitness club where cash flow grows, collection rates are high, and administrative tasks are minimal. This doesn’t have to be a dream—it’s achievable with intelligent billing
“Intelligent”
Tried doing that with my gym and they kept charging me, then threatened to take it to collections if I didn’t pay up. They also called me twice a day asking for money, and if I answered and then hang up right after it will call you back immediately. They also used a different number each time so you can’t really block it.
Can’t say anything about x11 but I use Nobara KDE with Wayland and it works pretty flawlessly. I found an article that’s a good jumping off point.
Nobara Linux (also aimed for gamers) has similar btrfs snapshots though not as intuitive and it’s not enabled by default also it’s based on Fedora. I have the KDE flavor as my main OS but I’ve never used the snapshot feature yet.
I switched to Linux a week ago, I’m part of that statistic
I was on a money save spree so I disabled some cards not knowing it was tied to the gym.