[munificent]

Which is exactly the fundamental flaw in any argument that "decentralization" will somehow solve problems.

Humans are social creatures and collusion is the natural order. Humans will cooperate unless doing so is clearly to their detriment.

[cle]

Decentralization doesn't mean isolation and that nobody is cooperating. It's a centrality measure. More decentralized networks have less nodes that hold outsized importance in the network.