As Daren says, it’s almost certainly a bug… but a little bit of me wants to believe that something big is in the works and that you somehow triggered whatever was being tested.
It’s all wild speculation, of course, but just two days ago, James posted this juicy tidbit:
In Zwift-speak, a challenge means something specific. And there are only three existing challenges so far, of which one is of course “Climb Mt. Everest”. 