OK, I have seen that you have erroneously deleted this tag from multiple amenity=fuel in Greece. I have reverted your changes in changeset 174032962.

Tagging petrol stations for shops is particularly important for cyclists, who want to know all opportunities for snacks and drinks along a route. If you don’t like my shop=yes tag, which is widely used, then you can tag shop=kiosk or shop=convenience as described on the OSM wiki article for amenity=fuel. Deleting the tag entirely, however, is not appropriate.