BTC.TOP is currently a private pool with the hashrate belonging to big miners who support Bitcoin Unlimited, a new grassroots client that continues the transaction capacity increase method bitcoin used for much of its existence. That is, without any centralized direction, miners somewhat spontaneously increased the block limit from 250kb to 500kb to 750kb and then finally to 1MB. With Bitcoin Unlimited, they can now increase it in roughly the same manner to 2MB or 4MB in line with demand as well as the progress of technology.
https://www.cryptocoinsnews.com/bitcoin ... ning-pool/