What you can, if you find a dealer, is to buy a risk swap contract that will pay you the contracted amount in the case of some house burnt or some earthquake happens or some bonds go south. This isn't an insurance in the sense of regulated insurance business. In stocks it is called options, in mortgage bonds it is CDS.
No I'm not. btw i trade options & risk swaps for a living, so I had a good laugh reading your mini tutorial on "this is called option, that is called CDS" :) Anyways, there's lots of holes in your explanation. For one, you say it is illegal to double-insure. Not true. It is illegal to double-dip, not double-insure. So you can get health insurance for yourself from your employer & simultaneously be covered by your spouse's employer - this is quite routine and legal, though frowned upon. What is illegal is to bill both the providers for your expenses. Another eg. you double-insure expensive realty, so if one insurance provider goes out of business, you don't have CP risk. But if there's damages to your house, you can recover losses from only one provider, not both.
As an aside, much of this is enforceable because insurance is such a heavily regulated industry, so you have centralized databases & its easy to check if you are double-insured, double-dipping & other edge cases. With HTBRAI, assuming such a thing ever comes into existence, you'd need a framework for all that regulation to fit in, which is what I'm skeptical about. airbnb is a fine service and they have a sound business model & a solid future - these insurance wrinkles will hopefully be ironed out in due course.
Other examples in the entertainment industry - say there exists insurance that your movie will earn a minimum revenue say 25 million usd. Your competitor simply buys those contracts and then trash talks your movie on the opening night ( by simply paying out bloggers and amateur journas some pittance sum of money ). Your movie tanks and so the contracts get exercised and your competitor makes a whole lot of money. So the next time around, you make a shitty movie to begin with. Then YOU buy the contracts, wait for your shitty movie to tank and cash in the contracts! This actually happens sometimes in Bollywood, though not in the exact fashion I described but in a more shady fashion.
Edit: I should have scanned the thread