I’m going to bed so I don’t have time to answer. But to answer this question is to explain what philanthropy really is, instead of what it pretends to be.
Maybe someone somewhere has made a comprehensive list of reasons porkies do philanthropy. The word philanthropy largely implies that we talking about porky’s ill-gotten gains and not our wages. AFAIK the major reasons are PR; tax advantages; backdoor investment; ego fulfillment; and power, both in terms of wielding it and in accumulating more of it.