That's a very good point.
The government is currently in a situation of owning an asset whose value is determined in part by the government's own policies on oil and gas production, and on the environment. The point you raised is very valid. That's probably why the government is interested in selling. It doesn't want to be judge and party at the same time. It owns a big asset, but it regulates in a way that affects, quite directly, its value. A prospective buyer would have to consider that. The environment in which it evolves determines the value of that asset.