I believe people offering bots services with guaranteed returns are doing this on purpose of scamming naive and greedy gamblers for profit. This includes hypothetical scripts promising to cheat online platforms in order to assure profit to players. In some cases I see gamblers who lost money they shouldn't have wagered at first place selling these 'money making methods' ahead to another gamblers in a desperate attempt to recover every funds they have let gone. That is, to not take responsability for their own acts and prejudice other people to recover their personal losses.
That's where we need to think how genuine the bots if the seller promise the bots will make a guaranteed return without any risk. If this bots actually can work and earn guaranteed return everyday, the seller doesn't need to sell his bots since it just make other people copying his way to earn easy money. If he can earn money everyday by just gambling using his bots, he will become a millionaire and no need to sell it.