Mobile recharges are retail telecommunications credit. The legal classification is the same as a prepaid SIM scratch card sold at a kiosk: a low-value retail product, paid for in any currency the seller accepts, with no money-transmission component.
FATF Recommendation 16— the international standard that domestic AML laws translate — applies to occasional transactions above $/€1,000. No single mobile top-up in any country reaches that threshold. The highest denominations on any operator we've catalogued top out around $200–$500.
FinCEN guidance FIN-2014-R012 and FIN-2019-G001 clarify that a US merchant accepting cryptocurrency for goods or services is not a money transmitter. The merchant sells a service, the customer pays — the merchant never transfers crypto on behalf of users. Mobile top-up sellers fall squarely under this.
The KYC step at services like Bitrefill or MobileTopUp.com is therefore a business choice, not a legal obligation. It usually exists to satisfy a corporate banking partner, an investor preference, or a card-network rule — none of which apply when crypto is the payment method.