The mode of payment decides that. If we use cash for payment, that is the most anonymous way of making payments, and that's how USD is used all over the world for all the illegal activities, just because it is in cash (physical).

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It will help with the adoption for sure, but there will be lot of regulatory issues to implement it because almost every government categorizes crypto as a digital asset rather than a currency so it is gonna be a lot of paperwork for the company to make it possible. This is why we need policies that supports and encourage the crypto payments not just for taxation then business will adopt the payment system so more payments that leads to more tax for the governments.