Additionally to the points raised by other replies, Ownership/power currently is in Binance and Coinbase, because very few people transact directly in Bitcoin, and those that do realize gas fees are so high so Binance and Coinbase provide convenience ledgers that they control. This is exactly the same process as if you were trading stocks on the stock exchanges. Everything eventually becomes centralized, to solve the problems like transacting and punishing bad actors that develop in the bazaar.