In an economic sense,
An INVESTMENT is the purchase of goods that are not consumed today but are used in the future to create wealth.
In finance
An INVESTMENT is a monetary asset purchased with the idea that the asset will provide income in the future or will later be sold at a higher price for a profit.
I really don't want to turn these into an economics class but the both definition of what investments are clearly should settle the argument of whether BTC is truly an investment or not.
Definetly every person have a different opinion and acceptance on what they defined about the cryptocurrency,some called it an part of economic growth,while the other called it investment ,but in my own perception,everyrhings are both on these cryptocurrency its will help the economic growth of the country while at the same time it is an investment of every people towards its own capacity.