OpenStreetMap (OSM) community data is used to supplement content in Esri basemaps. The process Esri uses for including OSM data is described in the OSM Data Usage in Esri's ArcGIS Online Basemaps PDF file (osm-data-usage-in-arcgis-online-basemaps-mapping-matrix.pdf on the ArcGIS Data Appliance 2022 Reference Content USB flash drive). A comprehensive country list is included in this document as well.