Mr green are more regulated and have much higher spends on players. Their bonus amounts will be less.
BTW – bonuses arent given out as much as we would like not because of the risk of cashing out. But because the sites have to pay the game providers on the spins.
Example…
Player loses 100quid on DOA. Casino pays netent 15%.
Player loses 100quid and 100bonus. Casino pays netent 15% of the 100 and 13% of the bonus. It’s almost double.
So they pay out 28% of your 100. Not 15%. When you operate on margins of 8-20% that’s a big amount to give up. It’s the entire profit.