For a start, bitcoin is revolutionary. It solves all the problems with the banking system.
For example, people's card details get stolen all the time. Bitcoin had solved this by using a new public key for each transaction.
When something is purchased using a credit/debit card, you are effectively using the same public key for every transaction. So what is happening is replay attacks. This type of scam is inevitable because the banking system is insecure by nature. It's built on a foundation of insecurity.
Bitcoin fixes all that. Bitcoin or similar is necessary for money-based economies to continue to work in the future.
Bitcoin and crypto are more than this. This is just one of the important innovations bitcoin makes.