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Mapbox is far cheaper, has a good free tier, and has the highest-res satellite imagery I could find.

Would it be interesting to explore using all services in a round-robin fashion and fully take advantage of all free tiers? Not sure if it's too much trouble for the possible benefits.

It could lead to an ... interesting user experience if different services had slightly different data

That's a good point.

But it’s certainly a concept worth exploring, if not for the sake of exploiting free tiers but maybe for maximum availability.

Self-plug: NetToolKit Geo (https://www.nettoolkit.com/geo/about) offers very affordable map tiles (both raster and vector) and geocoding (plus a simple autocomplete feature for within the US). You can also configure whether your account automatically replenishes credits if they fall below a certain threshold, so you can have better control of spend.

Leaflet + OpenStreetMaps

This is what we use now as well.

Mapkit is pretty good.

https://developer.apple.com/maps/web/