This thread is just wrong. While it's arguable whether or not tidus should change his signature (I'd say he should change it) it's definitely not a scam so this shouldn't be a scam accusation. The 'Amount Scammed' posted by OP makes no sense at all. I'd recommend tidus to change his signature and close that matter, but it's up to him if he wants to change it.

Regarding the signature campaign I don't see a condition that says the users who join shouldn't have a negative trust on other account they own. Maybe "Participants should have no negative rating" could be interpreted (because 'participant' can be an account or a person) but that PM posted by tidus where OP approves his enrollments should clear things out.