FWIW and depending on where you are this could be down to local regulations. A lot of (most?) polities do not allow insurance companies to simply set prices bas

FWIW and depending on where you are this could be down to local regulations. A lot of (most?) polities do not allow insurance companies to simply set prices based on their assessment of risks and the market, but rather place extremely heavy restrictions on the process (which further inevitably get politicized). They may also have regulations around minimum numbers of people to offer coverage to in an area and endless other related issues. So an insurance company that does the math and thinks it has to raise premiums 200% or whatever to make it work, unless somebody meets specific XYZ criteria around fire resistance (which are expensive), it may find that it simply is not allowed to at all, or not without long delays and a burdensome legal/PR battles. They always have the right to leave though.