[xdude]

As @deanhills explain you need to provide back-links if you are running a web server in your vps. I think you can provide a back-link in game server too but I don't know it for 100%. If you don't run a websiter or have websites in your vps then you don't need to. But till you can do this if you willing. You can make couple of social shares or write a review in other website. But it's not mandatory.

But all vps holders suppose to provide a signature link to their sponsor.