Bitcoin is anything but decentralized, as it runs on top of:
Centralized ISPs
Centralized energy
Now mining is becoming centralized more and more by big players
Most Bitcoin services and exchanges are private, centralized entities.
We have a long way to go to say the least. We must decentralize it all, though I think Bitcoin itself is the catalyst for this to actually happen.
How are ISPs centralised? Or energy for that matter. Especially energy. Isn't there a mining operation that uses geothermal energy? That's anything but centralised.