The "overload of customers" is a very stupid excuse for the big exchange platforms.They are created to handle multiple orders from thousands of customers.If some exchange platforms does the dirty little tricks you are describing,most of the customers will run away and choose other platforms.
Bitcoin will continue with all the Ups and Downs,it might recover to 20K,but it might fall to 2K.Such voaltility makes me feel that btc trading is more like gambling.