sadly bitrefill does not take XMR directly even though they take other crypto like LTC, BCH, Tron, usdt, etc, so we can't tell how much they receive from swaps for example, people that use an instant exchange to send xmr and receive other coins in the other end, but according to those swapping tools like the Orange Fren aggregator most swaps are also done with XMR as a pair, then this means any shop, big or small, can have active XMR users who can't actually pay in XMR