Which means MC was probably 'exploiting' DOGE block rewards by knowing when to mine high value blocks and when to mine something else. It's been suggested that a large pool was doing this for a long time since all the DOGE only pools were averaging well below the 500k average block reward that someone was out there exploiting the obvious to gain advantage to get a better than 500k reward by only mining blocks that were >300k or something like that. So now that DOGE is halved and other coins are being mined heavily then everyone else has evened out. Most likely the big issue was H20's algorithm didn't take into account the halving and stopped mining DOGE most of the time since the block rewards were deemed too low.