Free to play games do take your money, though. Especially Destiny 2, which is a free to play game that happens to cost about sixty bucks a year. And Rust did offer a refund to users, but not because Valve made them do it (my understanding is they had to actually negotiate with Valve how that would even work). They issued a refund because they announced a native Linux client and then backed out of that promise.

So yeah, no, I don’t see what reasonable expectation for refunds there is, I don’t see Valve having ever mentioned that Steam Deck compatibility being rolled back or removed would be grounds for a refund (at least outside their time limited no-cause refund policy) or that the reaction to compatibility changes with Proton or Linux would be any different across Epic, GOG or Valve at this point. Things may change if the Deck platform gets a lot bigger in the future and Valve decide to push for it as a closed environment, but that’s not where we are.

To your question, the other big game that comes to mind having done the same thing as Apex would be GTA V, which to my knowledge is still listed as “Unsupported” due to adding anticheat, despite initially working on Deck. And I guess you could count the FIFA franchise if you see it as a single game, because I think there was at least one of them supported on Deck before they rolled out Anticheat and all the newer ones have not been supported.

So it’s definitely not a one-off thing, and there has been no action from Valve.