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"second largest"? Did they pop out of nowhere? Today is literally the first time I heard of them.

Same here; never heard of them and aren't even in the list in coingecko: https://www.coingecko.com/en/exchanges

They are on the last page, with 0 volume. But the volume 2 days ago puts them at about 150th largest exchange. Practically an unknown and unused one.