Privatization? WTF are you talking about?
The white Rhino was saved by the establishment of the Hluhluwe–iMfolozi Park. The last 20 Rhinos were not privately owned, but protected by the state.
Had they been privately owned, they would almost certainly now be extinct. The idea that private enterprise would conserve and endangered animal for some far off future benefit when it is generally incapable of seeing past the next quarter is not just stupid, but dangerous.