[jononor]

If the US army had or was easily able to build this they would probably not pay large sums of money to Google. There are still many challenges in creating scalable robust solutions using machine learning in computer vision, especially when high degrees of response time and robustness is needed.

[candiodari]

Most, if not all types of machine learning networks are O(1). Keeping the response time constant is not needed.

Robustness is harder, but for this problem, not very hard.