Crypto can be used at regular merchants as well. It’s very handy for avoiding interchange fees, and annoying bank rules. For instance, my own bank will not allow me to make any purchases with a vendor outside of the US, even if I call them and try to pre-authorize it; their excuse is that there’s too much fraud. That means that if i want to buy, for instance, military surplus apparel and equipment from Czechia that I have to find a company that uses a US payment processor, or find someone that’s importing the surplus that I want, rather than going directly to the source. If I want a surplus Czech OM-90 gas mask, it’s about $400 new through a US distributor, and about $50 or less (…plus shipping) if I buy one directly from Czechia. Even allowing for the relatively small mining fees with crypto, and the costs of shipping, buying direct with crypto ends up being much cheaper than using a US distributor, or trying to find a bank that doesn’t either prevent foreign transactions or charge usurious fees for them.