I don't really understand the statement at the end that GHash has been "testing the waters" by sneaking above 50% for brief periods.
This seems to imply that the people running GHash can choose exactly what percentage of the mining power their pool represents at any given moment. But as a pool, wouldn't these fluctuations instead represent genuine variability in how many people are mining for GHash vs everyone else? How could GHash decide to "get brazen" and go to 55%?
They could be withholding some of their own controlled hashing power and either not using it at all, or using it to mine for other pools. I haven't been paying a lot of attention but I've seen people claim that GHash has been doing this in order to understate how much mining power they actually have.
What this means is that at any time GHash could take all that extra mining power and point it at their own pool and therefore increase their percentage.
This seems to imply that the people running GHash can choose exactly what percentage of the mining power their pool represents at any given moment. But as a pool, wouldn't these fluctuations instead represent genuine variability in how many people are mining for GHash vs everyone else? How could GHash decide to "get brazen" and go to 55%?