Why is the application of Blockchain to finance has this popularity than application of Blockchain to other sectors?
Blockchain technology can be applied in many sectors and is not restricted on finance sector.
What you hear of recently (DeFi?) is because of many new projects are created to join the party of DeFi. Last 2 months, people talkative about DeFi and it misleads you on how Blockchain technology can be applied in life.
Many sectors can use blockchain.