Blockchain is a system that is no different from the pyramid scheme that has existed for people for 100 years. invest your money. wait for other people to invest money and get rich. Who cares about blockchain technology?
That's cryptocurrency. There are some other applications of blockchain, usually centred around recording non-cryptocurrency transactions (transfer of ownership of diamonds being the best known example), or smart contracts for things like flood insurance where the activating event for the policy can be taken from a mutually trusted sourec. I think that most of them are inferior to traditional ways of reaching the objective, but they are not open to Ponzi schemes.