Why USDT works for hosting in Kazakhstan
USDT holds its dollar value, so the invoice never drifts between the quote and the transfer. In Kazakhstan the alternative is a card billed in dollars against a Kazakhstani tenge (KZT) balance. A local card is normally billed in KZT, and whether a dollar invoice adds a conversion fee depends on the bank that issued it.
Paying from a wallet takes the bank out of the transaction. The invoice is priced in US dollars, the USDT 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.