Really not looking forward to travelling Ryanair

Apart from the early flight, I was taking a look at their cabin baggage policy:

We reserve the right to cancel your reservation without refund and to deny you boarding if you arrive at the boarding gate with more than one item of cabin baggage or if that item exceeds the maximum dimensions.

Cancelling your reservation without refund? So if you turn up with too much baggage, and offer to throw it out, they could still cancel your ticket.

I don’t understand how they can get away with it! Why do people keep flying with them? Having said that, I still haven’t booked but they are one of only two airlines that fly to where I need to get!