No concept is bad, be it ICO or Defi. When a concept is successful, many scam projects see them, copy it and cheat investors. Defi concept is a good concept at present. If it can be used properly then something good will happen.
True, all the bad things that have happened are entirely the work of the scammers who copied them from the original project, be it the ICO in the past, the IEO in the past, and DeFi at this time, all of this is used by scammers to create projects new useless.