That's the four biggest pools (to get a consistent > 50% it might not even be enough) who need to collude. That's not very centralized. Of course the situation

That's the four biggest pools (to get a consistent > 50% it might not even be enough) who need to collude. That's not very centralized. Of course the situation could be better, but it's still in a good place imo. It's better than it has been historically for example when a single pool (GHash.IO) approached 50% by itself.