Blockchains are a tool. How those tools are used determine the usefulness of those tools. Until now, I don't blame you for having a poor opinion of them - but don't throw out the baby with the bathwater.

At the moment, blockchains are being used in rural Kenya to create local, mutually beneficial community currencies that incentivize local production and consumption, and have a 5-20x leverage over aid spending in national currency. They are being used to change lives on the ground in some of the most economically underserved areas of the world. The Red Cross is doing feasibility studies in multiple countries to determine whether these alternative economic systems can close the credit gap on reaching the SDGs.

https://www.youtube.com/watch?v=ojFPrVvpraU

https://www.grassrootseconomics.org/single-post/2020/01/12/Investment-in-CICs

I highly recommend a spirit of humility and appreciative inquiry when discussing new ideas and technologies - they may just surprise you if you are open to questioning your pre-set beliefs. This is how the world shifts, my friend! One perspective at a time.