The issue is that he was obviously lying. He claimed he was weeks away from autonomous cars. If this was true, he would've sold the tech for a staggering pile of cash.
Instead, all the evidence looks like he thought he could solve the problem on his own, in record time. Then he made a pretty basic POC (able to handle a small number of very simple conditions). Then he realized he couldn't do it. And so he pretended that he'd solved a problem nobody else had, but wasn't going to share or sell the answer with anybody else because the government is bad.
Unfortunately, some people hate the government enough that they want to believe this. But it's a dumb story and an obvious lie. George Hotz does not have autonomous driving technology. He never did, and he never fucking will. He's a snake oil salesman.