So I'm 100% convinced and agreed to your statement that "the term cryptocurrency is abused and confusing in mainstream". Ok. Next then I did some googling just to check any reference related to the word "cryptocurrency" and to my no surprise cryptocurrency word was never used any time before early 2017 and that was the time of shitcoins .
I believe you're mistaken. It was used fairly often (even the graph you show shows a small bump). It *was* a much smaller community though. Indeed, cryptocurrency.com was registered in 2009.
Bitcoin:
"A Bitcoin is a electronic payment system of the world where gravity is so strong that nothing—paper money or even governments such as Central Banks—can escape from it.
The theory of cryptography predicts that a sufficiently compact mass (21million coins) can decentralize governments to form a new world."
I don't believe cryptography predicts any such thing. In fact, that you use it that way makes me think you don't have a clear idea of what "cryptography" is. This is not an attack, I just think you possibly need to gain a broader knowledge of the things you're talking about.