According to  if someone combines non-horizontal layers together,
the results must be shared under the ODBL.
From my investigation it appears that the MAPS.ME app  is combining
OSM hotels with non-OSM hotels.
https://tianjara.net/hosted/maps.me-1.png is a screenshot from the
app. Hotel A appears in the app,
but as far as I can tell was never in OSM but rather one of the hotels
they've added to their app from Booking.com. Hotel B is from OSM.
This is the area https://www.openstreetmap.org/#map=18/-33.87758/151.20447
There are other examples of this too like this hotel
https://www.openstreetmap.org/way/196622136 which in the app shows up
next to their supplemented data like this
Am I correct that in order to be complaint with the license MAPS.ME
either need to make this data available under the ODBL or remove all
OSM hotels from their app?
 version 6.2.2-Google Data version: 160621
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