Earlier quoted context omitted.
If they think it's unfair, they could just... not rent their buildings out. There's plenty of buildings in the US that don't come under rent control laws that they could buy and rent out.
Landlords have the right to change their mind when it comes time for lease renewal. You're arguing that landlords should be forced to always rent their property to the same tenant once they begin. That's how ownership, not rental, works. Rentals are for a limited time by definition.
Sure, landlords "have the right to change their mind", but only within the legal/regulatory framework in which they've chosen to invest.
But hey, "Uber, but for residential rentals". There's clearly _some_ people who'd benefit from doing end-runs around the rules by which everybody _else_ plays...
(Just think for a minute about how surge pricing for apartment rentals in SF would look... All the "locals" moving out to Oakland or Pleasanton while WWDC or Google IO is on, and moving back in again during Burningman...)