This is a tactic that is used by the regime. They force the people to be displaced in order to control the area.
I will talk here about eastern Aleppo, Homs, Ghouta, Darayya, Mu'adamiyah, Al-Zabadani, Madaya, and eastern Ghouta. In all those regions, if you look at the population density in those areas, you see the forced displacement started two years ago in all those areas. The actual number is more than five million. Not one of these has come back to their place. It's a crime by the best definition of the word.