Just because some authorities implement it poorly doesn’t mean it can’t be effective. i just looked up new york rent control and it says

To qualify for rent control, a tenant must have been continuously living in an apartment since July 1, 1971, or be a qualifying family member who succeeded to such tenancy. When vacant, a rent-controlled unit becomes “rent stabilized”, except in buildings with fewer than six units, where it is usually decontrolled. In units within single and two-family homes, the tenant must have resided in the unit continuously since March 31, 1952, to qualify for rent control. Once the unit becomes vacant, it is decontrolled.[4][5] Rent control does not generally apply to units built after 1947. wikipedia

well then what is the fucking point? and rent stabilisation seems no better

We have social housing in the UK which is rent capped and it gives people an element of stability. It can work well