And with that computing power it's easy to install qemu-kvm and virtualise your own servers which is more scalable (and easier to move when the hardware you're renting becomes redundant) than having one or two monolithic servers with every conceivable piece of software installed, conflicting dependencies, etc.

The biggest additional cost to this is renting more IPv4 addresses, which Hetzner charge handsomely for now that there are so few available.