There are a lot of unknown benefactors....I know because I worked in the charity sector prior to my retirement. We got left legacies, some quite substantial, all the time. There are a lot of well known people in the entertainment business who donate large amounts of their incomes to charity too. Some do like to publicise it, but others do it anonymously. This guy managed to amass an amazing amount of money, and he must have had another source of income or he won or inherited it, there is no way a Social Worker could have earned that amount otherwise, frugal or not. Anyway he did a great thing by distributing it amongst his chosen charities.