I will like to keep this simple and short, you want to invest in DeFi projects? Yea they are the best presently in terms of fast growth and adoption but watch out for new DeFi projects because they are probably scam, you want DeFi project? Look into those that's been around since 2018 or max 2019, not all newly launched DeFi projects starts development in 2020, DYOR and Play Safe.
Well if one looks around and from past experiences as well starting from ICOs, there is every reason to agree with you. Most Defi projects which has been around before now can be a good investment choice at the same time while some upcoming Defi projects can be trusted but however only very few in this case; because scammers leverages on hype to carry out their plans and Defi has given them that opportunity. Also, if one want to hold Defi projects for long term, I would strongly advice old projects but for this new ones the risks associated with them might be too much for long term holding.