Why doesn't Qin Heng Island belong to Macau?

It is impossible to allocate it to Macao, but renting it to Macao is very beneficial. Unfortunately, the state has not done so. Neither Zhuhai nor Guangdong lacks so much land, but if Macao is given more tourism, Zhuhai, Guangdong will gain more benefits through cooperation. We can only develop commercial tourism culture for Macao. If we don't develop immigrant houses, of course, even if we sell them to Macao, it's nothing, but it's more in the national interest to cooperate with land investment to contain Macao.