No, the supply is limited. If someone forked bitcoin then it will become a different coin, completely different than the bitcoin itself.
The argument is again and again that the value of Bitcoin will increase because supply is limited to 21 million. But this is quite simply wrong. Every time Bitcoin is forked that is in real terms an expansion of the Bitcoin currency beyond 21 million. To some degree the same is true of alternative crypto currencies which will flood the market. There is already more than 1000 cryptocurrencues (
https://en.wikipedia.org/wiki/List_of_cryptocurrencies )
Th forking (or absence of it) does not effect Bitcoin's supply. At best, you can consider it as a "gift" to all bitcoin holders, which will increase the overall worth. It in no way impacts the overall supply of 21 Mn, which is set in stone.
That is precisely my point. I create "Bitcoin2" by forking. Then I create "Bitcoin3" and so on and so on.
In reality what I am doing is issuing more Bitcoin. That I call it a different name does not change the reality.
You create bitcoin A B C or something else but the amount of your original bitcoin is still the same.You are issuing another coin, forked from bitcoin. You can fork bitcoin 10 times but it will be useless if no one support that chain.
And so you create another altcoin based on a bitcoin key. Nevertheless, regardless of the name, it will not be Bitcoin, it will be altcoin with a name similar to Bitcoin. So it is possible to confuse a novice or inexperienced user. For example, Bitcoin Cach, despite the similar name and common origin, it is nonetheless not a Bitcoin.