I said market socialist. In a market socialist economy there would be no billionaires. Also housing is an absolute necessity, which means it shouldn't be governed by a market at all, no matter the economic system. Only things outside of staple foods, a roof over your head, utilities, drinking water, healthcare and other things absolutely necessary for your continued survival, can (not should) be governed by a market, and one that doesn't funnel money upwards.

Capitalism in any form is absolutely horrible and should not exist.

Also, creating artificial demand should be banned.

A market with a UBI would simply increase rent by the UBI amount

*Correction: an unregulated market with UBI would.

In a regulated market, those corporations can either follow the guidelines or fuck off the market.