I´m very concerned about this.
56% of the hashrate is unknown, not a pool. Maybe one person will have 51% soon --> so I sold all my monero´s

.
This could be a smart move. At least we can be almost sure those unknow hash rate are botnets. As we know monero has become the favorite coin to mine with botnets because there are not specific hardware to mine monero yet, it only can be mined with CPU and GPU. So, is the botnets get more than 51% from the hashrate that coin will be doomed.