It seems like manufacturers are now resorting to artificial means to curb demand, rather than increasing supply. What are the practical reasons supply hasn’t k

It seems like manufacturers are now resorting to artificial means to curb demand, rather than increasing supply. What are the practical reasons supply hasn’t kept up? Obviously, a fab is expensive but they have to be just printing money with these things in the current market. This really goes across the board with semiconductors as CPU supply issues are outrageous right now as well. Why aren’t more fabs being built? Is this just plain and simple greed?