I am not arguing against myself. People had been trying and failing to get insurance for car sharing for decades before Getaround succeeded at it. My co-founder is one of those people. Yet, even today, if you become a Getaround subscriber, your insurance company can cancel your policy. If that doesn't convince you about the slow moving nature of insurance companies, I don't know what will.

I know of few disruptive markets for which actuarial data sets are available.

Obviously you should think through the risks of starting a business not endorsed by insurance companies. If you have an appetite for such risk and believe the rewards (to yourself and/or to society) outweigh the risk, you should do it. Do you think Google could have bought insurance for their self driving cars before they started working on them?