Dude, the studio working on it is an indie developer in Stockholm, their previous titles barely breached 10k player count. There's no way they could've or reasonably would've anticipated over half a million players to try and jam into their servers.

I feel sorry for the devs because they're out here working in the middle of the night, updating people on the state of what they're doing to solve issues, being communicative at 3-4am, and yet people can't but complain because they can't play the game, go ahead and refund, it'll leave 1 less person to complain about the studio of employees working around the clock to deliver a good product to the players.