Ok, so clean images of handcuffer's T-shirt are hard to come by, but you can very clearly make out the Ryanair logo from the photos above. It's been confirmed on Twitter by Everton that he was making a Ryanair protest (as opposed to doing some free advertising for the low-cost airline).
It's also been claimed that the handcuffer's name is John Foley, who runs 'The World's No1 Anti Ryanair blog'. HE bears a major grudge against Ryanair. (He also seems to be a Liverpool fan). We're fairly sure this him at a rooftop protest.
Update - the Liverpool Echo has the entire story.