As for the vast majority of current DeFi, I agree with Nouriel Roubini's statement.
At the moment, it is undeniable that the big driving force of DeFi projects based on liquidity pools is an infinite cycle of investment to generate profits, and this is clearly a huge manipulation to the whole crypto world. Before YFI everything was fine, pools were still active, although there were occasional liquidity problems. Newly emerging DeFi projects suck money from the community and unjustly push their token prices up, the value created from a vacuum will return