I have no idea if it was profitable or not, however, the ZAG route used to be flown by SOF based crew.
This required the crew to nightstop in LTN on a regular basis and involved ultra long duty days.
Not sure if the economics worked brilliantly on a crew utilisation measure, or whether the route was profitable therefore. And when I say that, I mean Wizz probably found other SOF based routes that were less arduous to crew and had less instant overheads.
There is no link or cartel
AFAIK between Wizz or any other airline.