For example you can see recent import and revert at https://taginfo.openstreetmap.org/tags/amenity=fire_station#chronology https://taginfo.openstreetmap.org/tag

For example you can see recent import and revert at https://taginfo.openstreetmap.org/tags/amenity=fire_station#chronology https://taginfo.openstreetmap.org/tags/amenity=fire_station#... that is listing how many fire stations are mapped worldwide. Some well meaning person imported outdated dataset of fire stations in USA. Quality of data was - lets say - not great.