I don't use dlease but I can see that it can be an important tool for someone who invested quite a bit of money here and who wants to earn some passive income.
But like you said, I think it's important that the guys who do use the servive to check the person they are delegating to.
The tools need to give you the control. I have not looked deeply into dlease to see what options it offers. It ought to exclude anyone who is on a blacklist.