There's a craze because it's currently the best investment, is it safe? not for all projects as there are scammers everywhere.
However, if we like to find great projects, we can always check the projects on the list. https://coinmarketcap.com/defi/

Looking at the list, most of them have significant increase, and their trading volume is also very liquid, that is not a quality of a scam.
Well, you are right, we still have to be careful but it's okay to fall for DeFi HYPES as long as it's legit.