You can not clone bitcoin because there is nothing there to copy, bitcoin are result of caculation on the blockchain data, to clone bitcoin you have to alter the blockchain data, and blockchain is designed in such a way that since data is stored and secured they can not be altered this is common misconception.
It cant be clone but it can be forked or created something almost the same with bitcoin. Many users or developers have tried to recreate bitcoin with a different name but has the same purpose but since bitcoin is the first its literally hard to clone.
The presence of any clone is a clear illustration of the fact that the original is more valuable. The more clones, the higher the value of the original. Look at the bitcoin forks. There are quite a lot of coins, some are more popular, others less, but none of them comes close in terms of price, capitalization and user base. For the most part, these are all garbage and pathetic fakes trying to profit from the well-known
bitcoin brand.
Technically, it is not difficult to clone bitcoin and many cryptocurrency projects do this. I mean the coin itself and the blockchain.
And if think about it, what makes the bitcoin unique? This is decentralization due to the lack of a project team and the fact that bitcoin is the first cryptocurrency created.