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99% of the DeFi projects are now scam because scammers move on from IEOs and started migrating to DeFi projects but still investors feeds these beasts that's why they never quit.
These thoughts you mentioned are practically what people should look out though. Regardless of the trend of the projects, there will always be those scums trying to scam.
I don't think all DeFi projects do that, if you want to try to get a lot of profit from the DeFi project then you have to be smart in choosing the platform and project that is developed so that you will avoid a scam project.
And sadly, a lot of them are scam.