History is something we need to contend with, not just for neural networks, but also for analog computing which has a similarly troubled past.
For NN history, there has not actually been a market for NN accelerators until recently. You can see this because:
1. No NN algorithm was worth accelerating until AlexNet came along in 2012
2. What commercial products even use NN now? Currently it is mostly just voice recognition which is processed server-side.
Right now we are not attempting to go after any markets that a GPU would be sufficient for the reasons you mention; we're sticking to products that can only work with our technology. By the time we went after an overlapping market our credibility would be established and that wouldn't be an issue.