If this thought pattern becomes a reality, then it means crypto industry will become problematic. It's like asking for the manufacturing process an automobile passes through before buying it. What I think should be a point of concern should be if the sale or exchange of the Bitcoin is in fiat and directly to your bank account and there is a transfer limit on your bank account. Some banks do have such mechanism to deter money laundering. Other than that, I don't see why anyone should worry themselves where the Bitcoin they're buying comes from.