I believe a large percentage of people will be interested in such services because paying with cryptocurrencies while shopping online makes things a lot easier, and people would love to have such a platform to use.
I think accepting crypto currency as a payment method is awesome but in my view it's has few drawback, which may be wrong according to you now currently I am think about it. and that is if we accept crypto as a payment method it will easy for customer but will create huge financial loses for project in my view, we already know crypto are currently unstable and let supposed project collect 100,000$ of crypto currency and if by chance it dump and turn into 70,000$ so how project will face such loses but if instead of that they accept a stable USDt then it can be a good choice for them because here Atleast they will not face any lose in current time.
Companies like this make a partnership with payment providers like Coinbase, so when you buy something and pay with Bitcoin, when you send it to the generated address, it automatically will be converted by payment provider into USD and the process will be stable for the company. This is the least of the worries for businesses these days. They do not wait for your transaction approval to buy it, they should have a reserve of money.
According Royce's post, you are going to add EU in your business and that's very good, hope to see it in EU. It's good that you consider suggestions from users. I also think that it will be nice if you'll work privacy oriented delivery in the future. For example, lockers, you'll have lockers stored in different cities and different areas, users rent a locker, amazon bought products get delivered to that locker, user pays money for the locker and takes the parcel without revealing their address.