If you produce the map via your own code, and give attribution to OSM for the map, then as I understand it, what you do with that result is your business.
I think that you only have to give attribution to OSM contributors. I don’t understand what alexkemp said about using your own code: why not use any open source code to generate the map?
OpenStreetMap
Discussion
Comment from alexkemp on 30 November 2018 at 23:50
If you produce the map via your own code, and give attribution to OSM for the map, then as I understand it, what you do with that result is your business.
Comment from kresp0 on 1 December 2018 at 08:22
I think that you only have to give attribution to OSM contributors. I don’t understand what alexkemp said about using your own code: why not use any open source code to generate the map?
Comment from Obelixx on 1 December 2018 at 22:41
What about using a map created with Mapnik?