Seems many pools exit yet the Unknown pools are back. Unknown could be pools run by Mcafee, nchain (Craig Wright), Russian, north Korean, Greenland, hobbyists. Hashrate hovering at a constant rate. Now perhaps they can adjust the block down to 2MB to keep it a bit tight so no one miner can just scoop big for one block when there is some traffic. Then as designed, adjustable block size - can be increased in future.