I took Ryanair once and I'm sure they would price it at "I'd use it only at a gunpoint" level
Plus most flights are ultra short. Are people so addicted that they can't be offline for 30 minutes? In the time they can enjoy the Ryanair staff selling the lottery raffle tickets or asking everyone if they want to drink a €3 cup of water or if want to buy cigarettes at full retail prices
It's not a world leader conference, it's a meeting of assholes, grifters and criminals, and some of them are also world leaders