Why BNB works for hosting in Nepal
BNB sits in the exchange wallet many buyers already use, so the transfer is a withdrawal rather than a purchase. In Nepal the alternative is a card billed in dollars against a Nepalese rupee (NPR) balance. Local cards settle in NPR, so any foreign-transaction fee on a dollar invoice comes from the issuing bank.
Paying from a wallet takes the bank out of the transaction. The invoice is priced in US dollars, the BNB amount is locked for 15 minutes at the live rate, and the transfer goes straight to the address on the invoice. Nothing to approve, no merchant category to argue about.