> central authority systems like banks can fail, rob you or be hacked. Blockchain on the other hand is more reliable.

The body of evidence to date suggests that you're much more likely to be robbed of your cryptocurrency through fraud or incompetence than you are to lose your traditional currency from a bank.

https://magoo.github.io/Blockchain-Graveyard/

Furthermore, we've already seen examples of the "authorities" behind cryptocurrency executing a rollback to modify transactions they didn't like: https://www.coindesk.com/hard-fork-ethereum-dao/

I strongly dispute the notion that blockchain is more reliable. Maybe in some ideal universe where blockchain technology is not implemented and maintained by humans.