Ford dealers got together in secret to agree to fix prices on cars. They then told the public this was the cheapest they could sell them for. No-one could sell Ford cars unless they sold them at the prices agreed by the cartel.cartel (plural cartels)
The main EA body makes a public statement that fees are likely to increase to compensate for an observable change in market conditions. Not all EAs are affiliated with this body and consumer are free to use these EAs if they wish. Or indeed, not use the service at all.
Agree with you on the Ryanair thing. Some EAs may well decide not increase their fees or use a different structure that the client is happy with. If they are successful they will increase their market share, compared to the EAs who increased their fees, otherwise they will go bust. Sounds like a competitive market place to me, rather than a cartel.