Shopping on a store in another country often fails for reasons that have zero to do with your money: region locks, currency rules, and fraud screens. A virtual card is built to barrel past all of them.
Matching the storefront region
Plenty of marketplaces check that the card country matches the storefront. Issue the card in the storefront region so the order gets accepted at the right price.
Dodging currency friction
Because the card spends credit you funded with crypto, there is no separate bank foreign-transaction fee on cross-border orders. Just leave a small cushion for the store currency conversion.
Keeping your main card private
Use a throwaway card so your main bank card never sits on a foreign retail account. If the store leaks data, you delete that one card and shrug it off.
Budgeting a shopping spree
Cap the card at a shopping budget so a sale cannot pull more than you planned, and keep a cushion for shipping and tax that show up at checkout.