The companies are leaving because of mandated price caps from the government. In every other market when cost > price and they can't control cost, companies increase price.
You can only ignore the reality of government interference in the insurance market for so long.
I meant that at some point, with ever more costly and numerous disasters, the premium insurance companies would have to charge to be able to properly insure their clients would be too much for said clients to stomach, which would prevent anyone from getting anything insured. This has nothing to do with government interference. At some point the equation simply doesn't work anymore.