Is this bannable? FC leader got "voluntary" donations of millions of gil in 1 month

[Krotoan]

I really doubt that you can ban people for taking advantage of the stupidity of others in-game.

In ToS, a rule against exploiting other people does not exist.

I would say it's probably against this rule:

3.6 Any Illegal Activities. You may not conduct any illegal activities whatsoever in connection with the Game. This includes every illegal activity not specifically highlighted above, including without limitation gambling, defamation, harassment, and fraud.