Only just saw this note, but I already went ahead and cleaned up some of the added features as best I could, but agree that a gentle comment on their changesets would be a good approach to let them know how to  improve things. Looks like edits from these users were involved: https://www.openstreetmap.org/user/Le123, https://www.openstreetmap.org/user/%EC%86%90%EC%9D%80%EC%84%9C, and https://www.openstreetmap.org/user/Kate%20Martella