I have never had an issue on Linux mint that was not me fucking with the comabd line doing things it warned me I should not, or that wasn't outright a hardware failure
You don't have to sync it to their cloud you can sync it to your own actually. I use my bextcloud server to sync it and they have other options like WebDAV as well
Edit to add: they also let you self host the server they designed as well
I mean it was kinda destined to go bankrupt even under rge old owners. It only really ever produced a profit for like six months and was surviving of investor money
For me its less than that on both Linux and windows. Unless things have changed when I ran windows it was a exe file you just double clicked on to set up. If you have the bamining schemes correct and the way Plex has you set it up is the same its qui k
Microsoft is already done same with google I have like one niche product that I have not found a place outside of lime a singular stellar on Amazon to buy from
I have never had an issue on Linux mint that was not me fucking with the comabd line doing things it warned me I should not, or that wasn't outright a hardware failure