I like a alternate version of this: tax 25% of all donations to schools (all of them, top or not), and redirect the money to fund and improve quality of public

I like a alternate version of this: tax 25% of all donations to schools (all of them, top or not), and redirect the money to fund and improve quality of public universities. You still have a strong incentive for folks who want to show gratitude to their alma mater, and at the same time help improve access and equity to everyone else.