That is true, a lot of games can be played easily with the WASD + Mouse keybinds. Not unusable by any means, but it can be frustrating for people who get thrown off by the on screen prompts corresponding differently than what their controls actually are.
It’s also generally legal if you own the games on the console or physically and can dump them yourself (with the MIG dumper hardware). Of course though you don’t actually have to do that, you can but you don’t have to.