EULAs are not binding legal documents outside the US.No, the customer is not locked out because they do not own anything to be locked out from. Their license is revoked, which makes it's taken away from them. Since they no longer have a license then they can't access a service. Read an "End User License Agreement" and you'll see that you actually purchased access but not the game. Nearly every EULA is going to state this. Even when you get a physical copy of the game, you never owned it.
Now for Fallen Doll, I do not believe they have an EULA.
There is no reason for the company to give anyone their online infrastructure. That still is a tremendous amount of value to the company if they wish to sell it. If the company goes bankrupt, this is used to help the investors recover funds. They could still cannibalize the code and use the different objects for other projects and if they released it that very well can expose unknown exploits. Even startups tend to offer new hires equity in the company.
Anyways, evidence below showing that no one really "owns" any games.
As for this Always Online clusterfuck, hopefully the devs have a plan incase they ever need to shutdown the server or the load becomes too much to handle.