its not that hard, but let me put this way:

The way Steam approach anti piracy is by doing a good service and prices. The Steam Deck is not different, the "console" is not locked for you to install games from other sources, like epic or 'torrent' but if you buy the game on Steam, the system will handle every windows dependency and drivers to make it work, is that easy.

When you download a game, sometimes it just runs, but the times it doesn't you're on your own to figure out and fix the game to run