As an OpenStreetMap contributor I really appreciate the proper attribution you have in the bottom right, rather than hiding it behind a button like Mapbox and some others do - thanks!
This trend of “our branding takes priority over the required attribution for the free map data we’re using, but hey, they’re a little nonprofit so can’t afford to sue us” really ticks me off. Mapbox started it as a calculated move, and since then others have followed claiming it’s “the standard”.
But in this case I’ll assume good faith for now and hope it’s fixed. A simple “© OSM” would be fine.