They are just creating a DeFi project in paper but no actual foundation.
So yes, the crash is very imminent on these DeFi projects.
Only few of them will survived, the ones with real use case will survive.
But all the others will disappear once this hype is over.
So if you are an investor, need to be alert with these 'fake' DeFis.
The fact that both Coinfgecko and Coinmarketcap created a dedicated page for DeFi based token this can only mean that DeFi has potential in the future but like when Cryptocurrency are starting many scam projects are also coming up, so expect something like to happen, we just have to be vigilant and report DeFi projects that can be considered scam.