Steam Deck changed the landscape of dev support for anti-cheat significantly. It’s still not perfect, but most games relying on EAC work now with minimal issue. You might have to occasionally revalidate installed files or reinstall EAC for the game after a patch and that’s about it.
Other anti-cheat solutions are still a crap-shoot and likely won’t work. Thankfully, VAC and EAC are the most prevalent.