[dragonwriter]

Yes, the interests of private donors. Private philanthropy mostly feeds what private donors are interests in (weighted, of course, by having money to give, so for all intents and purposes, it goes where the interests of the superwealthy are.)

And those tend to be: things that are perceived by the donor as having high immediate returns, things that are perceived by the public as having high immediate returns and thus are good for buying status, and things that provide a convenient channel for the donor to exercise power via the donation, making it away to enjoy wealth while also getting a tax break for it.

Basic science doesn't tend to fit any of those, which is why science funded by private philanthropy is small compared either to government funding of basic science or total private philanthropy.