Tectonic activity on Venus isn't the same as it is on Earth. The plates are much smaller...and act more like pack ice.
And some of it's recent enough that Venus may be tectonically active, like Earth. We need so much more information, though.
How did the crust fragment like that and is it connected to Venus' runaway greenhouse? Hopefully the new missions to Earth's "evil" twin will give us some answers.
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