What makes you think that those who are behind ICO scam projects are different from this DeFi scam projects? I believe that those behind ICO scam are behind IEO scam too, Scammers are greedy people too once they make big money in a ill gotten way they will never leave, they will always come back to take advantage of those who are new to crypto and haven't had any experience about scam projects
yes it is true, there are some ICO scammers who always come up with new ways, like the current defi project. they target new players. however defi scammers cannot do as much as scammers in ICO.