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....Und wozu ist bitte das Fliegengitter an den Enden gut?....

Ducati was the first team to add this grill to their pipes, and others have followed suit in order to keep gravel out of the engine in a crash. Is this something that actually happens, gravel getting into the exhaust pipe? It sure does, as shown in the next image.
When Franco Morbidelli and his teammate, Mika Kallio, crashed at Mugello, Kallio retired but Morbidelli got his bike going and tried to rejoin. As he got on the gas, pieces of gravel shot out of the pipe.