DeFi and its concept is not scam. It just happened that its feature is favorable to scammer because of its decentralized feature. Many scam project really give a bad impression on DeFi but on the brighter side, It gives a lot of liquidity to the whole crypto market because of these new ideas attract many investors. DeFi is not scam but many scam project is using DeFi ecosystem to for there own personal game. Its to the investor to DYOR and be careful on what they are investing.