How does Group CV specifically work?

I'd assume logically it must be based on which group the winner is part of. If the winner shares two groups the giveaway was created for, I'm guessing it must count towards both of them equally. Since it's just a stat for fun and doesn't have any function, it doesn't need to be accurate.

I'm just guessing, though, it seems like the logical way it would work but I've never looked into this stat.

It would be easy to find out with couple of new groups and giveaways.

It's shared between the groups.

Example: 20$ value game shared with 4 groups = you get 5$ "CV" in each group. It doesn't matter where the winner comes from. Whitelist doesn't count as a group. Giveaway shared with a group and with your whitelist = full game value goes to the group stat.