That's simply not true. There are definitely good EAs out there. I'm using one right now called Traide Ringer and have had a lot of success with it.
It uses a Martingale trading system, so it's important to keep lot sizes small in order to limit risk in big swings, but if you have good risk management the system h as been very profitable for me.
There is really nothing it it for me other than sharing what's working for me. I don't own the platform and have no financial interest in it, however I'm one of many people using the EA profitably.