Look at DASH markets at Binance and you will see that whole sum of coins is about 8000-10000 coins.I didnt see any change on it since Binance offered locked savings for DASH.There is not at one single evidence that Binance savings attracked enough DASH to establish 400 masternodes. Not even close.

This "jump" in the masternodes coincidence with the DASH jump price in USD from 60 to 100 in July and August due to BTC rise.Most likely some bigger masternode operator,who has no access to ultracheap chinese electricity ,activated masternodes again when he went into profit zone through combining mining and running masternodes.At the same time DASH hashrate jumped from average 6 to 7 PHash.

I said before and I will said again - no ordinary miner will mine coin which is for so many months very deep in to unprofitable zone.DASH is for months only profitable if you are combining mining and running masternodes. There is no miner who will put significant money into DASH masternodes in the time of bear market. They cant afford it. But big whales with a lot of money can afford it.Because of such huge mastenodes reward they can push out regular miners and take control of market,masternodes and mining operations - full control of coin which put them in such nice position to accumulate a lot of very cheap coins(which precedes every bull run) and make another  pump/dump in the time they want. Something similar happens with other coins,but because there are no such hefty masternodes reward,whales are much more careful to maintain network running safely with some profit for regular miners.