Coinbase is down 88% from all time highs, and slightly less from its IPO. Coinbase has an $11.6b market cap which means he extracted a little under 1% of the entire company’s value in two years.
This has nothing to do with "product", though.
Memestocks are down ~80%. Crypto prices down ~70%. Volumes are down even more in many segments... >97% for NFTs.
Just because Coinbase was at one time valued almost 10x what it is now, doesn't mean that was the correct value - and "product" ruined it.
So he really extracted more like 2% of the value of the operations of company itself.