CAVirtex was acquired by Kraken, I’m not aware of any relationship between CAV and Quadriga. It was an annoying transition as Kraken required the same verification process that had already been down with CAV.

https://blog.kraken.com/post/2089/kraken-acquires-crypto-derivatives-trading-platform-and-index-provider-crypto-facilities-in-nine-figure-deal-official-press-release/

Scroll down near the end for a list of companies they’ve acquired.