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If you had a lot of capital, you could also deploy that capital completely outside of crypto, multiply it, then come back into crypto to have a larger stake in the crypto assset than you started. So your comment is true, but really applies to every freely traded economic asset.

Anyway, the mining/staking in crypto isn't primarily about increasing wealth, it is about defending the blockchain. In this aspect, there is a huge difference between the PoW and PoS. If someone has >50% of a PoS token, there is no way to usurp their control of the blockchain unless they willingly sell their tokens. With PoW, because the mining uses a different resource (energy), it is always possible to invest more capital to usurp the control of the blockchain by creating a larger hashrate. The ownership structure of the actual PoW token doesn't really matter, because outside capital can be introduced into the system.