This will need be a lesson for people, mostly for retailers and not CEO's behind crypto-projects.
One is expecting to hold dollars in a secure decentralized way, but when we talk about those full-backed assets, in reality there is not much difference from the risk of having one's money in the bank.

There is actually a disadvantage, since in the case one (as final user) does not have a say on what bank to trust.

On the increase of volume, besides increasing from people trying to swap their tokens for other reliable coins on Uniswap, the volume could be also due to people trying to pocket a buck, speculating on the value of USDC and arbitrage.