It’s not the majority of stake that controls the chain, it’s the majority of honest users. Rich validators can collude to have 51% staking power and start to ex

It’s not the majority of stake that controls the chain, it’s the majority of honest users. Rich validators can collude to have 51% staking power and start to exert unwanted force, like censoring blocks for their own profit or doing something else unwanted, but the majority of honest users can decide to coordinate a soft fork and point their clients at a new chain. The controlling validators will only be rich on the old chain.