And they either rent them at a high price or they lose money.

Like I wrote above, a friend of mine owns two houses. Under the proposed "no investment residences" rule, he can't, unless he leaves one of them vacant almost all of the year.

For some people, renting is the right thing. It's unclear how banning rental properties makes their life better.

Some people can't afford homes because investors are buying them. There is zero reason to believe that prohibiting investment properties would allow everyone to afford a home.