I am interested in this topic and I have been tracking all the pros and cons of using crypto for a long time. I like Bitcoin as the most stable analogue of the world currency. As far as I remember, it is possible to track transactions through the blockchain, but you need to know in advance about the proposed transaction in order to track it. This is not applicable to the general user. Most often it is used in gambling now, for example in
crash gambling. This gives you freedom of action and the ability not to use your bank account. I think the demand for Bitcoin will go in the direction of paying for entertainment and online services. But I don't think giants like Google or Amazon will allow crypto payments for goods anytime soon. There are many pitfalls associated with taxes and transaction disputes.