I see that this article says they were already giving 1.50 euro bonuses for this; on the other hand this other article from just a few months back says they "categorically denied" paying commissions for oversized bag detection:
O'Leary is on record as saying that this kind of "bad publicity" story is actually good for the business, because it builds up the Ryanair image that the base price of the tickets is extremely low and keeps them in the minds of potential customers. So I'm always a bit sceptical about how much this kind of story is real vs just a successful attempt to get their brand all across the news for a day...
https://www.dublinlive.ie/lifestyle/travel/ryanair-set-recor...
O'Leary is on record as saying that this kind of "bad publicity" story is actually good for the business, because it builds up the Ryanair image that the base price of the tickets is extremely low and keeps them in the minds of potential customers. So I'm always a bit sceptical about how much this kind of story is real vs just a successful attempt to get their brand all across the news for a day...