Doesn't seem to have a license in the attribution overlay. Is this not CC-BY-SA like the rest? Is it served by Tracestack? Can you use it in very small FOSS ap

Doesn't seem to have a license in the attribution overlay. Is this not CC-BY-SA like the rest? Is it served by Tracestack? Can you use it in very small FOSS apps without API keys? It looks really nice visually though.