It does have to do with being a walled platform though. You as the Discord server owner have zero control over whether or not you are taken down. If this was Lemmy or a Discourse server (to go with something a little closer to walled garden) that they ran, the hosting provider or a court would have to take them down. Even then the hosting provider wouldn’t be a huge deal since you could just restore backup to a new one Pirate Bay style. Hell, depending on whether or not the devs are anonymous (probably not if they used Discord), they could just move the server to a new jurisdiction that doesn’t care. The IW4 mod for MW2 2009 was forked and the moved to Tor when Activision came running for them so this isn’t even unprecedented.