There are many factors that cause the DeFi project to fail, ~
however DeFi is a new ecosystem and still in the development stage, there are still many gaps that increase the chance of failure, lots of bugs and other technical problems.
what's more rumours and news that seem to be used to create hysteria, creating fomo. Actually DeFi is good, can solve many problems in the financial sector today, such as being global, and is more flexible. Unfortunately, many scammers take advantage of this moment to load half-baked projects, create projects that seem promising and then run away after getting investor funds.
it's best to do some in-depth analysis before engaging in this.