From my personal experience in the UK, a few annec-data points:
A friend owns a Land Rover with such a notoriously bad engine that insurers refuse to insure it. Land Rover had to make their own car insurance [1].
Another friend owns an electric car that is becoming increasingly uninsurable. I'm told that due to the battery, any significant collision defaults to a complete destruction of the vehicle and not a repair. The second-hand market for electric cars is also terrible, almost no car dealer will touch them in the UK.
Another friend had a car that was insured for £5k, but it was actually worth more. An accident occurred that completely destroyed the car in a fire, and they offered £1.5k. They approached the insurer and said if £1.5k is adequate to replace the vehicle, then they could simply drop a vehicle off instead. Eventually they increased the amount to £2.5k, half of their own estimate, and far less than the vehicles actual worth.
Another friend got into an accident and was permanently injured. They got an initial offer from the other insurance company, which their insurance said to decline as they believed they should expect more. Several years of slow progress, with the original insurer shutting down and passing their work to several other insurers, they were told too much time had elapsed and they should have gone for the original amount. They offered a £50 "good will gesture" and then closed the case. In the UK we have the Financial Ombudsman for insurance disputes [2], which after review decided that £50 was perfectly adequate.
Another friend had their vehicle temporarily ceased by the police (the police were wrong to do so in this case, but you have zero right to appeal). They lost one of the sets of keys for the vehicle and scratched the car. The police told the person there was nothing they could do, and to claim on the insurance. They instead paid for the damage themselves, because the insurance premiums on such a claim would not be worth it. Just tonight I saw something similar where somebody's mirror was damaged in a hit & run, choosing to fix it themselves to avoid insurance premiums increase.
I used to send out parcels and insure them, but several parcels arrived damaged (admitted by the couriers) and they said they needed proof of packaging the items correctly. From therein I would video the packaging of all items and something occurred again, but they made it impossible to actually use their insurance.
My point is this: Getting insurance is becoming increasingly difficult, but also getting the insurer to honour their agreement is becoming increasingly difficult. In the UK you are legally required to have car insurance, but they are clearly robbing people with no recourse to justice. The system is already broken and not fit for purpose.
[1] https://insurance.landrover.co.uk/
[2] https://www.financial-ombudsman.org.uk/consumers/complaints-...