He can risk his time but not money as he only looks for free version of cloud mining and not the paid one's.......
A cloud mining service that is claimed to be free will probably ask for a deposit whenever the user requests a withdrawal.
There have been many websites that scammed people in this way.
They show you a number as amount of bitcoin you have mined so far and set a minimum withdrawal amount. Once you reach the minimum amount and requests a withdrawal, they say that you must deposit bitcoin for paying the withdrawal fee.