The latest load factors, Feb 2022 shows across the group WZZ were 91% whereas RYR was 88% which would imply more bums on seats. I know that doesn't mean profits but if Vienna is weak then it makes sense moving aircraft to more profitable markets. Was not Austria one of the very last EU counties to pull back from travel restrictions due to covid? Anyhow I can't see Austria being a particularly busy Inbound or Outbound destination currently. I'm sure RYR were offered a great deal, they do not go anywhere without a gift of a deal from the airport..