The platforms that store validator and withdrawal keys violate security meaning that there is the third party in the system. This leads to fees. The fees increase exponentially – the more validators participate, the higher the fee is. Yes, it’s harder to access this system, but the scammers manage to damage it anyway by reducing the profitability and etc.
What makes Blox different from platforms like that?
Blox doesn’t store validator and withdrawal keys. It allows to optimize setting up a validator and managing it in Eth2 system. It allows to maximize the profit and minimize the risks. But the main advantage is that the users fully control their assets.