Modern game servers for major games are simply just not designed to be run locally bare metal. They're often in the form of complex stacks of multiple moving parts, shit like entire k8s deployment stacks with like 12 distinct resources, many of which might be tightly coupled to implementation details.
They wouldn't need to release the whole stack to satisfy the requirements. Release the dedicated server executable and patch the game to allow direct connections to servers.
For an MMO it would be more complicated, but the movement also isn't asking to be applied retroactively. Existing MMOs built for scale are free to keep their current architecture. The only requirement would be that future MMOs are designed with an EOL transition plan.
They release, say, v2.4 of their game server program in 2025, it's tightly coupled to the auth server v1.7 api.
It's an API. Unless they hardcode the IP address it or use certificate pinning, it can just be reimplemented.