It depends on the activities, that is not cancer research money, they could be doing the some useful networking of people and firms on the early days of the foundation? Remember his son Beau relatively recently died of a rare brain cancer, he is not Trump who has no scruples, so look a little more closely at the activities and it will probably seem more reasonable why it closed after the Bidens committed to run for president. It was just an offshoot of the cancer moonshot initiative. Here you go: https://fortune.com/2019/07/15/joe-biden-cancer-initiative/ Someone has to decide if Joe is a billionaire from self-dealing with China or chasing pennies defrauding very public charities..