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what's the highest resolution satelite data that is commercially available actually?

10cm, available from e.g. https://nearspacelabs.com/ (using stratospheric balloons), or in 2025 from https://albedo.com/ (using satellites).

worldview3 and pléiades neo have about 30cm per pixel (the images are sold by third-party vendors such as maxar, airbus)

How are Airbus and Maxar 3rd party vendors here? They own and operate the satellites themselves