Hermez Network associated address deposited 3 million MATIC to Kraken

On February 17th, Spot On Chain monitoring showed that the associated address 0xa31 of Hermez Network (which has been acquired by Polygon) deposited 3 million MATIC (worth 2.85 million USD) into Kraken in the past 2 hours.
23 days ago, this address received 19.8 million MATIC from Hermez Network and now has 16.8 million MATIC remaining (worth 16.1 million USD).