I think the thing everyone is forgetting is that valve isn’t stupid, there’s no way they didn’t realize you could work around accepting the (legally unenforcable) NDA, and it’s open invite.
Valve 100% knows that keeping it “secret” is good for hype and was expecting this to happen at any time, and the nominal ban was expected, but nobody is gonna get sued either.
More people are talking about Valve’s “secret” new game because of this than would be if they openly announced it.
Think of it as the Mac appstore VS the Windows App store. Mac apps (flatpak) are the same as desktop apps, but sandboxed, the store isn’t intrusive, and people found it convenient, so it was fine. Then the windows app store (snaps) launched and it did basically the same thing but slightly worse, except Microsoft (canonical) forced it down its users throats, so people hated it.
Both camps are right, from a technical perspective, snaps are fine, but philosophically, it sucks, and the Linux community cares way more about the latter than the former, otherwise they’d all be running windows.