This is just talking about games approved through Valve’s verification process. There are a lot of games that work that are “unverified”, not to mention the entire history of gaming available through emulation.
cross-posted from: https://lemmy.ca/post/21835717
They just talk about Steam games that were verified by Valve’s process. So yeah, as you said, it’s much larger for people who are willing to do a tiny bit of tinkering 👍