You'd think custom server developers would find it easy to operate in closed networks and Tor. This isn't valuable enough for the US to break Tor for. Server hosts might have a harder time but a lot of them are closed communities like Minecraft servers are, so they don't get attention.
This sounds like fairy dust for this use case. You’re playing a real time game where latency matters, and you’re running all that latency sensitive traffic through a network of relays running on altruism - each hop would introduce latency and you’d deal with contention in the network.