I've used crypto for the property of fast irreversible online transactions. You can buy bullion cheaper than with say a card this way as there is no risk of the transaction being reversed and the merchant is able to pass the savings from reduced risk to the consumer. It also clears much faster than most ACH or wire transfers.

If you are involved in buying legal items online where the merchant has to deal with a lot of claw-back from the bank or card companies, they will generally give you a better deal with crypto.