It's nice that this isn't Google, and it's a good product, but it's still a non-Free product. I'm still looking for a FaiF version of something like this - does anybody know of one? Seems like a slap in the face to all of the OSM developers to use an entirely Free stack with a proprietary veneer on it.
Particularly since the author does not appear to be meeting their burden under the OpenStreetMap license.
"You are free to copy, distribute, transmit and adapt our data, as long as you credit OpenStreetMap and its contributors."[0]
"We require that you use the credit “© OpenStreetMap contributors”."
"For a browsable electronic map, the credit should appear in the corner of the map. For example:"