Rover makes enough money, why does rover charge me for background check?

I felt blindsided expecting me to pay for my background check. This expense is something rover should not pass on to sub-contractor. I feel rover should inform new hires about this before they spend an hour going through and setting up profile. For example I spent an hour filling out profile and forms just to be hit with background check at the end of profile set-up. If your going to make new hires pay for background check please make this more apparent and maybe not at the very end of profile set-up.