I have to say though that if they charge people extra because they couldn't do on-line checkin during those times, then that is blatantly dishonest and unfair.
I would presume people who have booked flights leaving during this period will have been sent an email advising them of the changes.
However, I for one do not tend to check email very often when I'm on the move, and my mobile brick only has limited texting functions.
I would certainly be very miffed to go into an internet cafe on the morning of my flight home to be greeted by this message. However, somewhere deep in Ryanair's xx pages of smallprint, there is probably a clause which says "we are not liable for extra charges in the event of non-functioning of our website, howsoever caused".
Anyone care to dig them out?