While it does make sense that those wary of GameStop chose to walk away from any type of deal they would have to make with them, it is childish to badmouth them. Notch is keeping Minecraft distribution to himself, and that is his right, but to my knowledge he's never openly said bad things about those services, or the people who own them, which is the way to go in a situation like this.
I'm interested in how this will pan out, but it's not something that makes me like Blind Mind. To the contrary, it makes me see them as petty. If they wanted to turn down a business opportunity that's fine, but how they told their customers was just silly and uncalled for.