[lawn]

Which doesn't in any way alter the supply of Bitcoin.

It's like saying I would dilute the value of the US dollar by printing billions of my own "fork dollar".

[briatx]

Each time it forks it creates the same supply of bitcoins virtually indistinguishable by anything other than name and mining nodes.

Sure, the limit of Bitcoin Core is still set at 21M, but that limit is quite arbitrary and in time maybe more malleable than people currently believe.