How centralized bitcoin mining is nowadays?
I have no idea... but please elaborate a little more if you know the subject.
What I do know is that ASIC miners started to "decentralize" the network (if I understand correctly) and the recent price action has helped this method for mining but we may be heading towards a break point where price and difficulty levels may give the advantage to powerful miners that are already setup, as opposed to new miners coming in and having to invest heavily now.