Please stop being worried about an single entity having 50%+ of the network,
Someone could have 90% hashrate and as long as he doesn't mess with the chain rules you've nothing to worry about.
That statement is not even remotely accurate.
The market does observe, and is sensitive to, what entity controls what % of hashrate.
All it takes is perception. The fact that such an entity is virtuous is of no matter; we need to keep any one miner well below the threshold that an average, ignorant as they may be, observer deems as an acceptable % of the network hash in total.