in fact this is still very difficult to apply, even though at present many small shops accept payments using digital money other than cash, but it still uses government digital products or banks instead of cryptos, so even though the crypto currency is already very popular and has become the community but there are many countries that still consider transactions using crypto a violation of the law even though there has been no firm action from the government but it remains an obstacle, besides volatile price fluctuations and no definite controls, making sellers difficult to determine prices and it is difficult to calculate profit (that's an important consideration because no one wants to sell just to lose). but if you accept bitcoin as a payment tool just as a side (as an alternative promotion to attract interest from the crypto user community), that might be one of the reason.