Right but you can make a new crypto out of thin air, you can't do that with gold. There is no value in it because you can just make a new one. It's more fiat than the fiat the kids complain about.
https://en.wikipedia.org/wiki/Metcalfe%27s_law
The value of Bitcoin comes from the same place as the value of any network. The amount of connections in the network is the value of the network. E.g. any social network. A Bitcoin copy has no connections in it, so it doesn't have any value.
WhatsApp on another comment was a good parallel/analogy, still it sounds a bit flimsy that value is tied to an amorphous network of people trying to earn money by mining, not sure how comfortable I feel with that as the only incentive for a whole network keeping my "store of value" afloat. Even more when this network can collapse at any time due to artifical technical limitations (in BTC's case the block size and low transactions per second count).