This stuff should only be legal if companies are forced to return you the full purchase price of the game.
But they are not selling the game for Linux. Only for Windows. It's another story that it works because of Proton but technically they don't support the platform at all. https://store.steampowered.com/app/304390/FOR_HONOR/ https://www.ubisoft.com/en-us/help/for-honor/article/system-...
https://www.ubisoft.com/en-gb/game/for-honor/news-updates/6j...