Maybe it wasn’t the first to come up with this kind of idea; I have seen people say things like this that there has been others that were created earlier before we had Bitcoin, but none of them were successful. So, what’s the need of counting them if they were not successful?

Bitcoin is the one that came out successful and is now widely adopted more than every other cryptocurrencies there is, so it should be regarded as the first. And another thing I was made to understand from some of the research I have made concerning this is that Bitcoin is the first to be decentralized. There has been other attempts to create cryptocurrency like bit gold and ecash.