I think there are 2 sides of this story.
1: those so called "donations" that actualy were payments for items and stuff.
2: or somebody actualy did selflessly donate money expecting nothing.
In both scenarios it wouldn`t be quite ethical(

) to do a charback, simply because in the first case - When you gave the money, ocean didn`t promise anything (the server will work - forever.) it`s all your fault.
And in the secound case - as people stated earlier - it`s a donation. In real life when you donate e.g. to a homeless person - i don`t really think you would eventualy ask for that money back.