Neat project. I haven't signed up and tried it out yet, but I see that this allows you to upload map data on top of OpenStreetMap stuff and share it. Depending on how the data is mixed in, the OpenStreetMap ODBL might require users to share their data back with the OSM project. Are you aware of this? Do you notify your users of this as well? The ODBL is kind of like copyleft license for databases (gross oversimplific…
Hi. When someone uploads a GPX or KML file, we have no knowledge about where is that data coming from, so we cannot display a notice either. Same as if someone would upload a GeoJSON to GitHub, GitHub would have no idea about where was that GeoJSON sourced from. I believe users should take care about giving proper credits in the map descriptions, and if not the author should be notified about it (which we'll be addre…
Its not an attribution issue. Its more that if the data is mixed into the database in a certain way, that data must also be made available under terms similar to the ODBl. So if I have the locations of the best Thai restaurants in a city, and I add this data to OpenStreetMap data, refine it based on the existing OSM data and present it, I must make my restaurant data available under the terms of the ODBl.
If you are just overlaying data on top of image tiles generated from OSM data I think you are okay, but once you mix the data it becomes weird. For example if the OSM data has a few of those restaurants in it, and you modify your data set to remove them so there's no duplicates, I think thats a case where you must share your data back with the OSM project. You can check out the OSM (non-dev) mailing lists for more discussion on this.