Let's make it as sort of competition to improve current Grind Bot. I think there is some people who can do it. Actually i'm gladly try to make it better basing on my PoE expirience. And it's better than trying to override or make another version of grindbot.
Going open source might give GGG advantage in finding easy ways to spot bot. Besides, too many cooks spoil the brew? Just a thought.
If only you guys knew all the things we've got in place to deal with quirks in this game... Needless to say, the grind bot will never be open-sourced. Don't be silly.