Rare’s Sea of Thieves has/had similar issues. They run all their game instance servers on Azure (from some deep divers looking at IPs the game communicates with) and can spin up/down as many as needed to handle as many players as needed (from some change logs a year or two ago).

That said, during times of especially high player counts like right after an update drops, there’s often issues when you initially launch the game and it tries to log you in. Gold payouts can also be delayed by a number of hours, but they’ve got some sort of queuing system in place so you don’t need to stay signed in until they show up. You can sign out and they can somehow apply while you aren’t playing.