I doubt there are actually any bots being used. I've written bots before and it isn't worth writing a bot for this. There are just too many ways to shoot yourself in the foot. What you are seeing is people watching the clock and hitting the "ok" button when they see it is time to play. A few dozen humans doing that looks just the same as a bunch of bots.
I agree with this. However, if the OP were to actually complicate the process by changing the address for each round, you can bet we'd see some bots creep into the game.