After an answer on December 2016 noboby neither took action nor answer to the new requests to attribute OpenStreetMap map.
This is pretty outrageous to the OpenStreetMap community.
Please STOP this violations. I'm going to alert again the OpenStreetMap Foundation.

Hello, after 21 months your map still lack the attribution. Could you kindly respect OpenStreetMap terms of use? http://www.openstreetmap.org/copyright/en

Thank you
license_mourner