I would assume that they plan to throttle or otherwise keep a limit on number of users. In case things turn out to be harder on the backend than they were expe

I would assume that they plan to throttle or otherwise keep a limit on number of users. In case things turn out to be harder on the backend than they were expecting. Could also be a fencepost in case they decide to shard users in a different way in the future and need to wipe people's save data?