Illegal coin mining

I have found a bug that farmers are desperately farming millions of coins daily and selling them at the lowest price and disrupting fair play. They have created automated robots that log into accounts daily and use the daily SBC for Silver Upgrade and Bronze Upgrade and use them to complete the SBC Markie Matchup and any other SBC trade. This bug will soon disrupt your point sales process and our fair play. This is to the detriment of the company and us players. Please remove the daily SBC for Silver and Bronze or do not renew it after a week. This is the key to preventing all their abuse. If this SBC does not exist, they cannot trade SBCs for free. You may not believe it, but they have hundreds of thousands of accounts and they offer everyone to participate in this. I hope you will report this to the security department.