Unable to answer "What’s the surface here?" – Tennis Court – osm.org/way/228002177 via StreetComplete 57.2:

Béton ? (Concrete?)

Attached photo(s):
https://westnordost.de/p/208603.jpg

"The legitimate placemarker is different, next to this one."
The place has gone or never existed. This is an auto-generated note from MAPS.ME application: a user reports a POI that is visible on a map (which can be outdated), but cannot be found on the ground.
POI has no name
POI types: internet_access-wlan amenity-cafe cuisine-vegan cuisine-vegetarian
OSM data version: 2019-10-19T16:52:54Z
#mapsme