Ryanair blocks 'illegal' bookings

[brotherhood of LAN]

The airline is targeting price comparison websites on which you can buy Ryanair flights without having to go directly to the Irish firm's site.
...
So-called "screenscraping" websites account for about 0.5% of Ryanair's bookings, equivalent to about a thousand a day.

[news.bbc.co.uk...]

[Quadrille]

The report doesn't make clear what the cash implications are, while talking vaguely about 'overcharging' - do these scrapers add on a 'booking fee' - else how do they get their cut?