From the Stop Killing Games discourse, that might not be feasible because of patents/licensing, work required and companies' protectiveness... But a suggestion I remember was that the companies could just be required to release all of the proprietary server binaries, so that somebody dedicated to the cause can figure out how to spin up their own server. This means a company doesn't have to clean up their sources and ensure they are actually buildable, and can just dump what they were already running somewhere.