And even if you use a bot, you still have to make settings on it so it can run the way you want. But if the market immediately reverses, you still have to set up the bot again. And that means you must still have the knowledge and ability to use bots properly.
Having a bot don't guarantee anything but it automates your trading which will save you time.
It's true that there's still a need to setup the bot and you can't just buy a bot and expect that it will bring you profits on an instant.
Making such with bots is a combination of your knowledge in trading and also what you know about the market. There are newbies that think you'll get profits easily by just having that but no.