you are just covering the obvious cases of scam bots. there are more sophisticated ones that don't need to rob you to rob you!
for example a while ago there was a bot that was being sold to people with the promise of huge returns and a lot of fake stats. the owner simply made money by fooling people into buying his useless bot while the bot wasn't doing anything malicious, it was just useless because it failed the moment bitcoin price went up (keep in mind this was during the downtrend).
They only aim at promoting junk bots saying it has lots of features and can make money automatically easily. the people to target are people who do not understand technically about trading and beginners who want to get fast money the easy way. They are the right target. Such useless bots are valued at high prices and some are priced at low prices.