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Want medium res (10m), Sentinel-2 imagery is your best bet. Won't cost you a penny. https://apps.sentinel-hub.com/eo-browser/

Looking for higher resolution (3m), the only viable option really is Planet. Even at that, they're pretty iffy with their pricing models and distribution. I think they range around the $2 per square kilometre mark.

for the whole planet, the jump between $0 and around $2/sq.km. is, what, $1 billion/update difference?

Sentinel imagery is weekly and is quite good. I use it to see snow melting in the mountains when planning hikes.

I'm no expert but there was an Ask HN about new APIs[1] recently. One answer linked to Albedo[2] which seems quite interesting.

[1] https://news.ycombinator.com/item?id=27067945 [2] https://www.albedo.space/

There’s a company called PlanetLabs (or just Planet) which aspires to this.