This accusation is grave mate. Although I have not tried it at your exchange but binance fee is normal and ok to go by but bkex charges seems too exorbitant and outrageous for such a fee payment.
If am to use an exchange at all, i try to make comparisons from more than two exchanges and see what they offer in their transaction charges, i also considers many other factors along the line before arriving at my conclusion because exchanges cannot be trusted in some aspects as well especially when dealing with money and fee rates.
However, your proof is not factual mate. What you have uploaded is not feasible for a proof to hold unto. I will advise you get good proof may screenshot it wherever it is written on their site then upload it here so we could see.
Users must consider the first thing before making an accusation about anyone, website or exchanges, which is the evidence and i believe that's the most vital part of every accusation made related to scam, giving a proper referencing is as well encouraged for proper understandings.