Should a malicious actor try to tamper with the underlying protocol by using a large number of validators to revert a finalized block (the equivalent of a "51% attack" in PoW) their funds are slashed — meaning they lose a portion of their staked ETH.
While this is true, the author did not mention what will happen if the attacker acquires 66% ETH. In this case they can do any attacks without being slashed, as they will fully control the beacon chain.
While this is true, the author did not mention what will happen if the attacker acquires 66% ETH. In this case they can do any attacks without being slashed, as they will fully control the beacon chain.