I have an odd question, what is to stop mining rental services from withholding difficulty solving shares? To keep you renting?
Nothing. It's always been the greatest risk of renting.
To be fair I hit 2 blocks in one day at this pool using nicehash. 25 + 25 = 50 btc but btc was only 400 usd at the time.
As to all the rentals I pointed here I most likely am down just a bit.
I also hit 2 blocks on mmpool renting from nicehash.
But I don't rent much and point here. Due to the hack last year.