My beef with them is for how they handled the pivot from Media Browser to Emby. For the uninitiated, Media Browser was a plugin for Windows Media Center that was a front end for any content you had locally (or on the LAN), I used it for accessing my Music Video and Concert content along with My Movies for movies and TV. Media Browser had theme support, and I found 1 that suited my need to browse my content perfectly - it was literally the ONLY ONE that showed it the way I wanted. Worked great until one day the devs decided they were moving to a monetized model and re-named it Emby, Media Browser updated automatically, without asking, and boom, now the 1 theme I used was now behind a paywall....
I'm not a cheapskate, if it was a paid theme from the get-go I would have paid for it (their "store" offered paid themes, too). But to pull the rug out from under me, well I'm petty and don't forget these kinds of things.