The matter is that now it is impossible to say without doubt that Bitcoin is absolutely decentralized, unregulated and independent. When the crypto-exchange rialtos appeared, they killed the decentralization of bitcoin. And the mining of bitcoins has now become almost inaccessible to the average person, mining "centralizing" is taking place. Bitcoin will not become completely centralized, because it will kill its purpose and features. But the elements of centralization can be traced already now.