We use Amazon Web Services – VERY expensive if left on 24/7 but very affordable technically since you can just “shut them off” when you’re not using and not be billed. (Contrariwise, if you leave them on – wham! Huge bill, so just set alarms on your phone to remind you)
Amazon Web Services is only special since it has servers with dedicated graphics available, e.g., their G-line (G2 currently). Make sure to install the drivers since they don’t do them themselves!