Why is using bots a terrible idea? The reasons you mentioned apply to gambling in general, not just gambling bots.
Of course, you can apply certain strategies in the hope that you will beat the casino, but you can also do this when gambling manually. Gambling bots and scripts only make the process of betting faster. And there are many examples where this is actually very useful.
Gambling bots are only for running games on automatic mode and faster intervals on gambling games, but there are many other fake bots that promise wins to trap gamblers because there is no bot script that works to beat the casino other than relying on luck factor. Sometimes gamblers don't use gambling bots to enjoy slot games manually.