While planning my summer holidays I came across the glamping site Owayy that seems to use OSM map data, but with no attribution?
Definitely OSM data. I also do not see an attribution.
I would start from writing to them as described at Lacking proper attribution - OpenStreetMap Wiki
I added them to the list (at the bottom). You can mark that you notified them at Wiki or post that here and I can update wiki info.
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They merged with Campanyon that use Google Maps: Camping and glamping await | Campanyon
Campanyon uses OSM map data and does not show attribution (on an iPhone 12 mini)
That little circle of that stream is my personal “trap street” (and not in Zurich).
added Campanyon to Lacking proper attribution - OpenStreetMap Wiki