RyanAir is (in)famous for this type of shit. E-tickets are used everywhere, but RyanAir forces you to have your ticket printed on paper or on their own mobile app. If you don’t, you’ll pay 20+ Euros for the employee at the check-in to print it for you. I think these ludicrous fees are meant more as “fines” than revenue.
Whether you like RyanAir or not (and I don’t like them much), they are good at keeping their prices low by cramming as many people as they can on each flight as quickly as possible. This means disincentivizing anything that can waste them a few seconds per passenger, be it additional baggage (the base ticket now has no baggage at all, except for a small bag or backpack that can be placed under the seat) or, I guess, checking someone’s identity at check-in.
Well in terms of certainty of flying, RyanAir is not worse than other companies. If anything they are a bit better, as I don’t think they overbook flights like other companies do and (by generally flying to secondary airports) they tend to be less affected by delays/congestion. I wish you good luck with your flight!