I think in the context of the OP, not all donations have strings attached in the sense of trying to exert control. Maybe smelting orphans is undesirable but for donations previously received there's nothing the donor can do about that other. And picking and choosing who you donate to isn't a form of exerting control either.
Whereas large university donations do usually have agreements signed that could drastically change school policy. These are "donations" to exert control in some form or another
Like $20 for the first 90 minutes. Makes it very affordable to not own a truck for the few times a year you might need to haul something home