Yes, not all investors are lucky in investing in the crypto market, especially in the DeFi hype some time ago, quite a few investors lost their money due to scam projects. However, these things do not deter most crypto investors from continuing to invest in crypto platforms.
as long as people still enjoy investing in crypto, of course they will prepare themselves with things that may not be fun, because in crypto anything can happen and nothing is impossible.
Obviously I agree with you is the most painful thing that investing that we don't know is a scam and it's very painful. Every time a new system grows in crypto, especially when it is successful, there will be someone who misuses things to do project lies in order to make profits, so not only Defi, IEO, even ICOs, which are very successful for a long time, are also exposed to fraudulent projects.