I think this is less corruption and more vanity. There are a lot of charitable organisations out there who will routinely donate over a million dollars. They'll get a hospital wing or entrance or statue or something named after them. I think compared to those charities, open hand is incredibly small.

My guess is their strategy was to do a bulk donation to get some kind of recognition for their mum. They were probably hoping they'd have much larger sums in a shorter time, and then time just kept on going.

The problem is, that would have been fine if it was their money they were doing this with, but they're doing these shenanigans with other people's money, and now open hand is probably done for as a charity.