IMO it's only fine as long as it respects the user's choice and doesn't keep on asking. If I choose to not donate, do not nag me about it the next year either.

IMO it's only fine as long as it respects the user's choice and doesn't keep on asking. If I choose to not donate, do not nag me about it the next year either. If I choose to donate, do not remind me to do it again. I will do it myself if I decide to. Perhaps it's cultural - where I live repeatedly asking for money is highly frowned upon and only lowers the reputation of the non-profit doing it. The non-profits who only ask once are much more likely to receive multiple donations from the same person.