I never really bought a lot of Ubisoft games because of their poor practices and buggy games, but the thing that pushed me over the edge never to buy from them again was with Anno 1404.

They took Anno 1404, made a few tweaks (the largest of which was some higher resolution support iirc), and released it as a new game, Anno 1404 history edition. They then delisted the original game on steam and made the two incompatible for multiplayer.

So if I wanted to play a game I already own with a friend who didn’t own it before they delisted it, I would have to buy the game a second time. It would only be $15 to buy it, but it was a massive “fuck you” to everyone who owned the game