Android games are normally going to be inferior to Steam games, but this is still a nice option for games that aren’t available on Steam or can’t be played due to anti-cheat reasons.
You can read more about Waydroid here. There are reasons to believe valve is working on adding official Waydroid support to Deck, but until then you can install it this way.
It’s interesting that anytime people use a Windows VM to play multiplayer games of Linux, some devs become very hostile and ban them. But if the same thing happens using an Android VM, there is no noise. Why this difference in attitude? 🤔🤔