Unlike credit cards that do always require for shops to use a third party payment processor, there is nothing that prevents online shops from taking money (cryptos) DIRECTLY from buyers!

Shops do NOT need any payments gate here at all! (see how-to above if you need)

So, when a buyer is seeing that a crypto payment is received through a third party crypto payment processor like that https://www.coinpayments.net/  the buyer is involuntary thinking that the third party payment gate guarantees him a PROTECTION against fraud in a way!

And here https://www.coinpayments.net/  by NO means does that!

While it definitely could!
It would just have had to accept buyer's money into its own temporary wallet (for example) for a period of time, or just block withdrawals of cryptos for merchants for a time, or in any other way, but it MUST have protected buyer's money in a way!

Otherwise, why is it needed at all???