Thank you, the city admins see to it that the surroundings are clean. That is one reason that Vienna won the most liveable city in the world for 2022. It is also the healthiest city in the world based on the survey conducted in Jan 2022. I think the tourists can also see how clean it is and perhaps no tourist would simply throw trash on the grounds, it would be shameful for her/him since the waste bins are all over the place, lol.