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Rationale
The Google Group is not much used any more, and over in Iris we have been discussing retiring it (SciTools/iris#3860). Do you have any objections to that? Iris have decided to use GitHub Discussions instead. Possibly Cartopy doesn't need anything to replace it as there seems to be quite a lot of Cartopy activity on StackOverflow.
Implications
One less place for users to ask questions, but also one less place that support people need to keep on top of.