Hmm, maybe. Wizz also tried (and have now given up on) Jersey. Seems to me to be a genuine attempt to take people to the very few places they could go at the time of planning. Unfortunately, as BA318 mentioned there really isn't enough accommodation in GIB to soak up the demand, and the testing/paperwork requirements for both GIB and JER have since changed with short notice, putting many off. On top of that, GIB and JER are both already being served by increased services from BA and/or Easyjet, both of whom are longer-established in the specific market. Now that the amber list restrictions have eased, it's hardly surprising that Wizz has cut its losses to look elsewhere.
Even amber-list resorts are now £££ as people book the few places available so personally, I'd be delighted if Wizz continued to open up new and underserved destinations, especially in Balkans, Black Sea and Georgia ... but anyone running an airline is going to stick with safe bets for the forseeable: Canaries, Costa del Sol, Greece.