Slightly off at a tangent. Today I went to the Just Giving site to make a large-ish donation to a seasonal appeal.
Going through several steps they started to ask for all sorts of personal information. Basically it was mandatory to create a login "account" even for a one-off donation. I read their long privacy statement. It appeared to say they would assume they could do anything they liked with my personal information.
So no donation to the charity - at least by the published online route.