I stopped on Page 5 when ITT; people argue with a lawyer without even understanding the complexities of the situation.
GREE could easily say that this violates their ToS. Cataloging this data for use could be considered to violate the TOS. The distribution of this info to bypass the (LOL) "safeguards" (of it not being shown in-game) of rivals' "private" data (in-game, standard gameplay, not your personal private info / rights violations) for your use to "modify their experience" may violate the TOS. This is not a criminal matter. This is someone looking at the unencrypted data traveling over their router, in their house. At the very best, GREE could attempt to create some way of finding them and banning them.
So gree has the right to boot them off the server. Good luck.