As a Bitcoin fan, I think the invention of Bitcoin itself was useful and has proven itself in certain areas, and there's been a couple Bitcoin forks or inspired

As a Bitcoin fan, I think the invention of Bitcoin itself was useful and has proven itself in certain areas, and there's been a couple Bitcoin forks or inspired projects that have done real worthwhile innovation (Ethereum to name one), but otherwise nearly all cryptocurrencies outside of those two are just copycats with no innovation (not counting a tweaked identifier) that have absolutely no reason to exist outside of being pump-and-dump scheme.