A good amount of that is most definitely wash trading, so don't get too excited when you see those numbers lol. A record high percentage of the total trading volume has moved to DEX's primarily Uniswap.
Uniswap has a lot of limitations though, which sucks a LOT. Some of these limitations is gonna be solved by Blocknet.

More info here: https://cointelegraph.com/news/decentralized-exchange-vows-to-remove-defis-limitations