whoops, i mis-typed my comment.
I meant that mining would physcically CENTRALIZE, but that these central datacenters could be owned by an increasingly decrentralised base of investors/hosters.
(for example, greatnorthdata might have several megawatts in a single facility, but the hardware is owned/controlled by several dozen (several hundred in future perhaps) different miners
Mining shares don't work...have you tried em?? I have twice & lost each time
Maybe IF you own the miner & find a cheap place to host (which is not the same as shares),but shares of miners fail every time................
Show me the profit or breakeven of your Greatnorthdata shares

right now, its not reliable. its full of scams and high prices. but as bitcoin becomes better regulated and trusted technology companies get involved i expect it will become much easier and safer to own shares or assets with "transaction verification services" such as bitfury.
were only a few years into this project - if its still kicking in 2020 i expect much more mature and powerful services built around both bitcoin's use and mining