The profitability of trading bots simply differ from bot to bot, as they have their own indicators and stuff. And yes, trading bots
can definitely be very profitable, assuming that the user of the trading bot knows what he's doing in the first place, by tinkering it and making it better as time goes.
I have recently set up a bot and have been astounded by the operability of it. It's actually working lol.
If the bot you set up is currently doing really well, great. Good job. But don't assume that it will work great forever. This is a common mistake with trading in general, that could potentially end up burning the trader. Just a heads up.