Yes It Is
i dont think you are right, all cryptocurrency are not scam,
yes will all know that some are scam but that dont cartigorised everything as the same they are many legit cryptocurrency that has add value to peoples life, e.g BITCOIN, ETHEREUM, LITECOIN and so many others.
so take your time to learn about cryptocurrency i believe you will understand it better and it will also help you differentiate the scam from the legit once.
Exactly, what was your basis to say that al cryptocurrency are scam? Or maybe you are hust unlucky and experienced it in a very early age. You must be study first about bitcoin to know if they are scam or not because there are lot of cryptocurrency that was very useful like bitcoin. Maybe when you read more about cryptocurrency you will find that you are not right.