Why so many A380s fly to Johannesburg?

I just happened to filter all airborne A380s and noticed no less than 5 are currently headed to JNB. What about this particular destination makes airlines fly this aircraft? One wouldn’t think it’s an especially busy airport.

I just happened to filter all airborne A380s and noticed no less than 5 are currently headed to JNB. What about this particular destination makes airlines fly this aircraft? One wouldn’t think it’s an especially busy airport.