Auctions - means against DDOS attacks

Hi,
I’ve dive into MCD way of finding right price of collateral that is liquidated in CDP default.

I wonder what are means used by MakerDAO to prevent flooding smart contract with transactions untill there is timeout. Theree is already known precedence of that behaviour working and that is Fomo3D blockchain game where attacker wass able to flood smart contract for 24 hours in order to win main price