Everyone’s citizenship i.e., license for occupancy, can be revoked. How you got your license determines the length of time it takes for revoking it. Having an occupancy license doesn’t provide you with much sway as to whether a license to occupy should be extended to another person. Nor does having a license provide you any basis of authority for commenting on the form of occupancy another occupant holds. The license is not exclusive.
In short, your license was issued to you by a stroke of luck and the stroke of a pen. It is not your property, this thing called citizenship. You didn’t earn it. It was given to you because like any tax and customs farm, a good farmer (politician, capitalist, economist) knows that the higher the population of occupants, the greater the amount of tax receipts and number of potential voters.
Hell. You haven’t even taken a few minutes, like any mature, self-actualized person would do, to ask yourself why should you need a license of occupancy i.e., citizenship, permanent residency, visa, etc., to live anywhere?