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How is BTC decentralized? Monero, Pulse, Hive, Hex are the only decentralized currencies I know of and none of them are booming. No governments are talking about backing their currency with them. BTC is being bought up by the largest companies in the world, who currently run the world. https://www.bitcoinmagazinepro.com/blog/top-10-bitcoin-mining-companies-how-they-rank-by-hashrate/

When the Bitcoin network went online in 2009, any1 could mine BTC with as little as an old laptop. The consolidation of miners (not so much a centralization) began when pools became a necessity. Recently, Wall Street got involved via ETFs.