Bots are actually exist since the first days of freebitcoin, at least I know there were many people abusing freebitcoin by creating many accounts to claim the free btc. If those old abusers are not banned yet,
Very unlikely they survived that long.
Instead of splitting the lottery, it is better if freebitcoin find a better system to avoid those bots so bots wont be able to join the lotteries.
That's what we did.