So they should call it a Windows Religion. Religions have all of the benefits, and none of the accounting. Religions do blatantly illegal things (like buy spare land, then rent it out for a profit, and roll the profit from that business venture into the church losses, while getting the extra land tax-free). But since nobody wants to go to hell for arresting God, nobody cares about the abuses by religious charities.
And if B&M Gates is poor, try the United Way and the piles of other charitable organizations who exist to solicit donations, skim admin fees off the top, then redistribute the funds to charities they see fit. Any charity that actually does something, even if that something is bad and unneeded, is still better than 90% of the charities out there.