Do teenagers charge for flying kites?

No charge. According to the story of Good Boy in Du Yuan, Good Boy in Du Yuan is a large-scale public welfare column of Weifang Science and Education Channel, which is open to the majority of teenagers and free to participate. "Du Yuan Good Boy" is a children's column in Weifang jointly sponsored by Weifang TV Station, Weifang TV Network Channel and Weifang Media Network. I watched it on Weifang TV station WFTV 1.