It's dedicated servers from AWS. But they are not cheap, I'd recommend to use host instead for this kind of genre.
Thanks for the reply, I wonder how much exactly do they cost, Photon offers 100CCU max for 95$/year, which is decent I think? I will donate you a dollar at least for the server run.
With AWS GameLift one c5/c4 instance can handle 20-30 games, which is 40-150 players for 60$/month
