The Bitmark chain was configured to penalize inconsistent profit driven indirect mining of BTC.  In other words if the diff drops and price rises, and everybody greedly jumps on to mine the coin then abandons the network, the penalty is that the coins mined are not released until after the difficulty changes again.  Net effect is that if mining stays roughly consistent or varies slightly then people get their rewards fairly and timely, if they try to game the system by profit switching then they get rewards tied up until either price and demand rise 4x to meet the target network, or difficulty finally retargets, or indeed mining becomes steady and fair.