Bitcoin is _not_ magically produced by the sun striking the ground.

There are mild returns to scale in running large-scale mining operations and as a result mining power seems to actually be somewhat centralized under the control of a small number of players: https://digiconomist.net/cryptocurrency-decentralization/

Not to mention that "decentralization" is a technical property and not necessarily desirable in itself. Users might care about fairness, avoiding sanctions, purchasing illegal goods, etc, but these are only weakly connected to technical decentralization.

From your link:

    In March 2023, the New York Times identified a list of
    just 34 Bitcoin mining facilities (controlled by 22
    different entities) in the United States, which
    represented about a third of the total worldwide
    Bitcoin mining network at the time.

34 such $365M/year entities would have to collude to attack bitcoin. And accept that their business is severely damaged afterwards.

So much for the decentralization and security of Bitcoin.

How does the situation look like in other chains?