I’ve been running a SUSE Linux server continuously for the last 5 years without a crash, the only time I’ve had to restart it was after some doofus cut the power with a backhoe two years ago, and that was a safe shutdown on backup power.
Lot's of PC's out there still running Novell's PC DOS software....think of gnarly years old PC's in Auto Repair shops...where the big usage is pulling up part's manuals.