there is no way for new users of the blockchain to tell which chain is the correct one after this phony chain is made public. Under PoW, it is trivial to tell the fakes from the real one – the arbiter ...

However, now the Beacon Chain and Ethereum mainnet will be merged during this upgrade in mid-September 2022. As a result, all activities on the Ethereum network will switch from PoW to PoS.