Ryanair really are a pack of chancers, and will try anything if they can get away with it. And why wait until June 1st to implement it? Do it NOW!
Just something I noticed. The briefing is to determine the passengers' suitability to assist in an emergency. So imagine Joe has paid his money to sit there but they deem him not suitable? Do you really think they're going to ask him to vacate it and have to reimburse him the 10 quid he paid for the seat? Nope. That's money in their pocket, so they'll leave him where he is and hope he isn't called into action. Cutting corners for safety's sake. Luckily they've been found out.
Prior to the commencement of taxi, an operator shall ensure that cabin crew conduct an appropriate awareness briefing for those passengers seated immediately adjacent to self help emergency exits. This abbreviated briefing shall determine the passengers’ suitability to occupy the seats and seek their consent to assist in an emergency evacuation should the need arise. The passengers shall be advised to read and understand the operating instructions for the self help emergency exits, which are located on the exit placards and the passenger safety briefing cards.
It shall be made clear to the passengers in the briefing that such exits are designated as “self help emergency exits” and there will be no cabin crewmember presence at them.
On a more general note, I really don't see why people are so hung up on what seat they get anyway, unless they're traveling with young kids, etc. People willingly pay extra for "Priority" boarding, yet complain about other charges they have to pay. If you're at the end of the priority queue then you could have just instead gotten to the front of the "Other Pax" queue and you'd save yourself a few quid!