part of the value is the network participants. just because you can clone facebook in 2006 doesn't mean you have enough people on there to make it worth anyones time.
this is exponentially true for a cryptocurrency or a 'utility token'.
you're missing a lot.
Say I own a very successful dapp. It become very expensive to run it because on the base token price. I move my dapp the the clone chain with all my user. My user don't on what chain the dapp is running.