I don't think anyone is stopping you from using an older version of a game or older firmware, given you can obtain them (legally) and you're ok with the limitations this might impose. For example, if you're not on the latest version of a multiplayer game, you might not be allowed to play. On older firmwares you might not get full access to the application store. Etc. The point is, you don't need a law, but it might not be easy to get an older version running.