Housing in not expensive because of one group buying all of the housing, its expensive because housing is hard to do due to government regulations, expensive due to same regulations, and the currency has been destroyed infavor of the rich for decades. The only reason a large corporation would own SFH is because of how the fed controls the money supply and how housing is incentivized.

Rent is not double the mortgage.

Maybe the base mortgage payment, but you also have to pay for insurance, taxes, maintenance, utilities.

If you can’t get good terms on a mortgage you will also have a higher rate and PMI.

Yes poor people must pay more for the same house, and rent can be cheaper.

Edit- Hexbears: grow up, get a job, buy a calculator, and try to figure out why you are so wrong.