This is true for all types of surrogacy. There isn't an ethical way to do it: by paying money it's incentivizing impoverished women, but not paying money is even worse. Pregnancy takes a toll on a woman's body, carries health risks even with healthy women, requires doctor and hospital visits, and arguably deprives a woman from engaging with starting her own family during her best breeding years.
This is true for all types of surrogacy. There isn't an ethical way to do it: by paying money it's incentivizing impoverished women, but not paying money is even worse. Pregnancy takes a toll on a woman's body, carries health risks even with healthy women, requires doctor and hospital visits, and arguably deprives a woman from engaging with starting her own family during her best breeding years.