Hello CouscousPie, welcome to OSM and thank you for your contibution.
OpenStreetMap is not a map but a geodatabase from which countless maps and applications are created. The respective map creator decides whether and how something is displayed. Coffee and snack vending machines are not shown on the main map, but they are shown on special maps. After clicking on ‘Run’ (Ausführen), you will see all vending machines in Leipzig here:

https://overpass-turbo.eu/s/2eBv

More information also at https://wiki.openstreetmap.org/wiki/File:Osm-tutorial.pdf