ASICs at the next smaller process node have just become available. For miners, this requires a response to either pony up for the new more efficient equipment, or start your exit from the mining game. As long as the older gear is still revenue positive, it will stay in service. Given the rate of adoption of the new generation, this may not be very long.

IOW, this hash rate boost is driven by chip geometries, and does not require collusion with exchanges to be beneficial for the miners.