I'm a crypto enthusiast and I don't share the common view here that blockchain is useless, however ... how do you offer 12% interest on a stable coin? Where is that money even supposed to be coming from?
When new people invest, you can take their money and use it to pay the people who were already invested.
Why am I thinking of Egypt now?
token farming from tokens that are given as incentives for using different dApps. These incentive tokens have value because of the speculative nature of the human brain.