alt Hacker Newstbf, Ryanair generates a third of its revenues from other ancillary offerings (including kickbacks from insurers and car hire firms as well as its legendary fines and fees) so it does fit the general pattern of it being unprofitable to simply sell tickets in competitive markets...
Those other companies do too So it's not distorting the competition IMO. If none of them had kickbacks then the prices would be overall higher but people would still fly because most of us don't just fly for the hell of it but because we have places to go.