Charities prefer undirected funds, but most will accept restricted funds if the funds are big enough. They often have whole negotiation & legal teams devoted to

Charities prefer undirected funds, but most will accept restricted funds if the funds are big enough. They often have whole negotiation & legal teams devoted to working with donors to figure out a set of restrictions that's mutually agreeable (i.e. reflects the donor's wishes while minimizing how much of a pain it is to the charity to deal with). Two common examples are donations to museums that are restricted to development of a certain collection or type of work, and donations to universities restricted to funding a specific field of research.