That is a weird drawing of Bitcoin history that I dare say is wrong because by including unrelated events and clients it creates confusion specially since "fork" has a different meaning depending on the context!
In the context of this topic and possibly what that image was trying to say, a fork is a copycat shitcoin that copies bitcoin's source code and possibly even the blockchain and creates a copy of it naming it something else. Like bitcoin gold, bitcoin cash, ...
But that's not the only thing the image shows which is the confusing part.
For instance bitcoin knots is a fork of bitcoin core project in the Git sense and in programming. That means they copied bitcoin core's code and modified/improve it. But it is still called Bitcoin because it is the same exact implementation of Bitcoin protocol. So it is NOT a different category or a branch as it is falsely shown in the image. It should have been in the same orange line and be called Bitcoin.
Then there is others like ilbbitcoin which is not a fork in any sense of the word, it is just a different and stand alone implementation of same protocol called Bitcoin and because of that it must NOT be a different category.
Then they are also including fork meaning upgrade like BIP16 or the recent one like SegWit. But again that is part of Bitcoin's natural advance and should not be in a different category with a different line. There should only be one straight orange line called Bitcoin.
Your are indeed right pooya87
While the chart does list 2 only Bitcoin forks it lists an awful lot of other projects and upgrades
which are in fact not forks. The chart is titled as a "List of Bitcoin Forks" - I suspect then that
the author/creator of that chart went off on a tangent and listed other stuff or maybe didnt
know the meaning of a fork.
The question is can, and the answer is yes. But that’s the wrong question. It should be should we, though the answer remains the same.
Bitcoin has been very successful, so why would we even consider forking it? That would only add to the list of failed hard forks in the past.
So I think the question has already been answered, and no one would seriously consider creating another fork when it would most likely end in failure.
I guess forks in the past have been mostly created in the thinking that they can improve on
the Bitcoin blockchain but thankfully it wasnt the case, biggest and baddest of all was
Bitcoin cash / Bitcoin Satoshi vision by Faketoshi.