The A380 doesn't make sense for cargo. Too much volume for the weight it can lift. At the average plane cargo density, an A380 cargo would be at weight capacity way before it gets to volume capacity.[1]

The A380 cannot lift much more than a B747. But it has more volume, which comes in handy for passengers, not for cargo.

[1]: https://www.flexport.com/blog/airbus-a380-no-cargo-equivalen...

edit: 747 n° mistake