Well its probably because it doesn't work very well. If he was making millions of his autobot he wouldn't be trying to sell it for such a cheap price. Not a scam but it won't make you rich either.
It works okay but it's not worth spending money on. It's just as good as any basic betting system rather it be martingale, variation of martingale, or other strategies like d'alambert or cancellation systems. The only thing that's really interesting is that it's a nice and welcome change from overly repeated game formats like dice. It gives a sense of greater control since you can manually choose which block or blocks to open up before you land on a mine. However, I usually just like to let the random chooser do that.
The main reason I sell it and not give it for free is the fact I was able to reverse engineer all the functions of the site using quick and easy poweshell command. You can use them in any method you like, I find the adaptive martiginal most profitable but you can use which ever method you like.