Travellers who booked through screenscrapers are being refunded and asked to go to the Ryanair website to rebook.
Ryanair is well within its rights to do this, and if travel agents/agencies wish to book Ryanair flights on behalf of their clients, they can arrange to do so with Ryanair.
AFAIK Ryanair is not completely unreasonable. They've said in the past that they are amenable to arrangements. Seems like "unauthorised" agents are being bumped.
As much as it annoys you, the airline doesn't care because they will get other customers from elsewhere. I've made my dislike of Ryanair clear elsewhere on PPRuNe in the past, and the latest development only reinforces my view.
If you don't like what Ryanair does, there's Easyjet, BMI or the scheduled carrier.
:-)
S.