No surprise here. That's the biggest reason to not get involved with pre order schemes. If a company doesn't have the resources to bring a product to the market with their own money that's a huge red flag for me. They have basically nothing to lose if the product fails, never comes to market or they just fold and leave the pre order people holding the (empty) bag. If they do get it built all they have to do is keep announcing delays while they mine with your pre paid miner. It's a win/win for them, an I might win/lose for you.