They could have easily crammed the Steam Deck full of stuff to make it hard to use for piracy - locking down everything, making it usable only to play games you legitimately own, force you to go through who knows what hoops in order to play games on it. That’s what Nintendo or Apple or most other companies do.
But they didn’t, because they realized they didn’t have to. It’s 100% possible to put pirated games on the Steam Deck - in fact, it’s as easy as it could reasonably be. You copy it over, you wire it up to Steam, if it’s a non-Linux game you set it up with Proton or whatever else you want to use to run it, bam. You can now run it in Steam just as easily as a normal Steam game (usually.) If you want something similar to cloud saves you can even set up SyncThing for that.
But all of that is a lot of work, and after all that you still don’t have automatic updates, and some games won’t run this way for one reason or another even though they’ll run if you own them (usually, I assume, because of Steam Deck specific tweaks or install stuff that are only used when you’re running them on the Deck via the normal method.) Some of this you can work around but it’s even more hoops.
Whereas if you own a game it’s just push a button and play. They made legitimately owning a game more convenient than piracy, and they did it without relying on DRM or anything that restricts or annoys legitimate users at all - even if a game has a DRM-free GOG version, owning it on Steam will still make it easier to play on the Steam Deck.
Steam itself has some kind of DRM. You need to login to Steam to access the games you bought (sure there’s offline mode but then you can’t download your games, update or buy more, so it’s only temporary convenience). If Steam dies one day, so will your Steam games library.
However, the service is great, so it’s not annoying.
Steam DRM is trivial to circumvent, it’s basically cheap locks screwed onto the game with security torx, not even riveted: If you have a toolbelt you’re already in and every skiddie with half a brain cell can do it as Valve doesn’t bother defeating the scripts that are floating around.
What it does prevent is random tech-illiterate people copying game files to their friend’s box.
If Steam dies one day then my library would be largely lost, yes, but not due to DRM but because most of my library isn’t actually on my disk.
That is absolutely not correct.
Steam policy is if valve shuts it down, they’ll give you enough time to download all the games and run them without drm.
I feel like if Steam dies we’re in some kind of end of the world scenario anyway so there probably wouldn’t be time to game anymore.
Or maybe exclusively time to game as we live in our caves waiting for the fallout to settle. How many watts is a potato?