Ridiculous money making game. It was 1 cent to enable chat with paypal or credit card and now they upped it to 3 dollars. It is nothing to do with "safety".
Put in zombie mode for tdp4, 1 person gets picked at random and the people he kills then goes on his team as well. Last person remaining wins.
The zombies could be the green mutant skin.
It would be nice if it could cover the servers that run it, but alas it does not.