Cudos to the OP for a most awesome investigation.
That said... how exactly does the BGS actually mess up game play? If there's morons stamping sand castles, just go somewhere they aren't.
The BGS doesn't mess up gameplay. Manipulating the BGS is gameplay itself.
As for going somewhere they aren't, that's not really doable. These suspected bots are deliberately targeting the work we've spent close to three years working on. If non-bots were doing it, that'd be perfectly fine - that's part of the game, and we play on an even playing ground. However, bots are not an even playing field.