The recent appearance of Defi project massively on services sections, Have kept me off balance. But I need to understand the future of Defi projects, and why stablecoin "Dai" is doing better than bitcoin and Ethereum on the long run? The disadvantages of DEFI project is an added thank you. 
Defi projects work differently. Actually its just a termed for a dapp that works like in real finance system like lending, savings or even farming which can be noted as simulatenosuly with staking. Seriously it is just a staking for me that let you actually earned dividend. I am also confuse why do you say that dai is better than ethereum in the long run, like its a stablecoin and lack progress in terms of price. While eth has a lot of use cases on different field.