Most games run on an executable and local database which is why pirating will always be a losing battles for game developers, the problem isn’t download and run the problem is does it need to connect to Ubisoft services to use. It’s like those singleplayer but still need to connect to the internet games. Either way theirs always a way to bypass these things. A good example is when I uninstalled steam but still had Terraria I can run the exe straight from the folder and it works.