These platforms formed what we know of today as "E-commerce". They have been here and have served to the best possible extent that they can; however, these platforms including the websites operated by small businesses are wrought with issues.
Those issues are related to privacy risks which lead to compromise of customer's and merchant's competitive advantages, personal data, and business data. Furthermore, the payment methods offered using national currencies have expense rates and limited inflow due to the friction associated with credit cards, wire transfers, and the banking system. When cryptocurrencies are involved, the privacy compromise leads to target creation where wealthy cryptocurrency holders can become easily targeted for hacking and theft.
https://safex.io/