Blockchain applications:

1. Scamming people by selling them crypto currency
2. Scamming people by running a crypto exchange and then pocketing everyone's funds
3. Scamming people through pump and dump scams given the entire crypto market reacts every time you sneeze

There are infinitely many applications for blockchain, any time you need a regular proof of ownership or custody only with more steps (and more hands reaching into your wallet to participate in this new business method on computers on the internet with blockchain).