Well, if you look at Fortnite, their servers couldn’t handle the millions of new players. What did they do? They fixed their servers to be able to handle the huge surge of new players. I don’t know if any of you guys have heard about 2b2t(the oldest minecraft server), but when a famous youtuber made videos on the server, thousand of new players joined. The owners of the server put a cap on the amount of players that could log on at once and everyone would have to wait in a queue. Players could buy a pass to skip the queue and be first to join. If Era implemented this it could add to their revenue by selling queue skip passes for gralats or itunes.
Even if Era was advertised, it unlikely that millions of players would all join at once. Right now we don’t even know the max amount of players that the server can handle. So IMO too many players wouldn’t be a long term problem.