I'm not saying there are no good AI for trading but if there is a good one, nobody will sell it or even tell about it.
Oh, they are not going to sell their AI solution but definitely use to promote their company with the tools. Big investment firms are already using some of the most sophisticated AI solutions for trading and their clients are benefitting from them too. The more investment they get, the more money they make. So if they get returns of about 20-25% they wouldn't mind sharing 5-7% with their clients. If you fancy what goes in such tools, check this open source project
https://github.com/QuantConnect/Lean