Doubt anything would happen, but if it does, the companies did it to themselves.
They used to release server files, it wasn't a special thing, it was expected. Games like Battlefield 2 can still be revived and played long after EA has forgotten about it because server files were released for anyone to host their own. You can still run a quake 3 server and the list goes on for old games.
That all ended because you can't shut down the servers and force people onto the next game or push micro transactions if players can host their own servers.
They used to release server files, it wasn't a special thing, it was expected. Games like Battlefield 2 can still be revived and played long after EA has forgotten about it because server files were released for anyone to host their own. You can still run a quake 3 server and the list goes on for old games.
That all ended because you can't shut down the servers and force people onto the next game or push micro transactions if players can host their own servers.