[taneq]

> there's a lot of value in knowing who your donors (customers in the business scenario) are for non profits

Well, of course, but the things they use that knowledge for are bad for me.

> They get additional income from selling lists

OK, then they're already my enemy.

> they want to reach out and build a relationship (especially recurring donations)

Ah, there's a word for people who try to build a relationship with you in order to repeatedly get money off you: "Scammers."