100K Penguins! Bazzite hits 100,000 weekly active devices, growing 14k devices in the past 3 months.
(universal-blue.discourse.group)
I think rpm-ostree has origins from Fedora, or to be precise CoreOS. I'd also say when it comes to atomic/immutable, and even if you're a power user, using it should probably be down to a minimum. I've been on Bluefin for almost a year now and I can't recall using it once.