Herpa have lost many licenses over the years. Southwest, Ryanair and FedEx, for example.
The only Easyjet models produced in 1:500 were only very old 737s by Herpa in the early 2000s or so... but fortunately JC Wings released an A321 recently.
1:500 scale is sadly a dying scale, hanging on because of Herpa. In the 2000s we had Starjets (the 1:500 branch of Gemini), InFlight500, BigBird, Hogan, Aero500 (the 1:500 branch of Aeroclassics)... but they all vanished
Nowadays, only Herpa remains, with other brands releasing very random models once in a blue moon.