The Borg is very thoughtful, clever at implementing things I find. With the new bible ''silver sword'' released 2years ago, I do believe the word ''tithe'' is fitted very nicely somewhere in there.
Since the Borg can fit things to fit their own teachings, they can simply have a WT study on giving ''to Jehovah'' and point out there it is, ''tithe''. Voila, there you go.