"The first thing that jumps out in the data is that a lot of Steam players have a controller. Since 2015, over 30 million players have registered at least one controller and over 15 million of those players have registered more than one. Between accounts with multiple controllers and controllers that have been registered to multiple accounts, we find that a total of 60 million device-account pairs have been connected to Steam."
That's a lot of controllers. Valve said most are console gamepads that people have connected to their PCs; 45 percent are Xbox 360 controllers, 20 percent are PlayStation 4 controllers, 19 percent are Xbox One controllers, 7 percent are PlayStation 3 controllers and the remaining 8 percent fall under the "Other" category. That list is dominated by the Steam Controller, gamepads made specifically for PC, the Nintendo Switch Pro Controller, and more.