No, this is free market. Here, an innovation has increased the efficiency of mining and this is communicated to the customer via the price system. All exchanges involved are voluntary.
My bad. Of course it is free market. It is not preferable type of market for miners though, since their profit from tx fee tends to 0. This in the future, as previously noted by @jonny1000, won't allow to sustain large amount of mining power, decrease Bitcoin network value and create death spiral.