As to why Microsoft is charging 99 cents for the pack it is likely to do with licensing. Last I checked, Microsoft is not operating a deep-space telescope, and such images in 4K are rarely free ...

Live 4K video from space! See 24/7 views of Earth from the ISS via Sen cameras; ... Space is part of Future US Inc, an international media group and leading digital publisher.

As the International Space Station Beamed a 4K Image, Broadcasters Focused on the Future. At the just-concluded NAB Show, the latest advances in 4K, HDR and high frame rates were all on full display.