Valve blocked API access to their database. We can not confirm anything anymore: https://arstechnica.com/gaming/2018/04/steam-spy-announces-its-shutting-down-blames-valves-new-privacy-settings/
The numbers are by Valve, there is no other way, Valve wants to control the numbers. We can not know if they are real or made up.
They got millions from gaming companies, money is not the problem and even if i give them money they will not do what i want. They handle money differently.