This morning, in an Italian international airport, I was in line to board a Ryanair flight. Since the line wasn't moving (they were probably waiting for an empty bus), I went to the toilette where there was a line too, but I stayed there.
I came back to the gate in no rush because my flight was still "Boarding" on the screens. When I got to the gate, the steward raised her eyes from the screen and looked at me; at that time the screen updated to "Boarding closed"...she closed the gate just before I got there!
I argued with her (an airport employee, unrelated to Ryanair) that she never passed to "Last Call" on the screens or made any PA before closing the gate. She replied: "in this airport, we don't make any last call for Ryanair because they don't pay us for this service" (same words, but in Italian!).
I didn't even try to make her open the gate again because I know it's almost impossible, so I just asked for a piece of paper where someone from the airport declares that "they never make any last call for Ryanair" but no one wanted to write it. So, I suppose it is something they do but they know they shouldn't.
Is there any rule about the last call? Is it mandatory somehow or is it just a service from the airline/airport?