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No one will use that to pay food, I rather use a digital fiat than spending bitcoin which is every day an increase happens. It's fine to treat bitcoin as an investment because if you think it's the most profitable way then it's normal.
Absolutely no one? Well, I dont think so.
Firstly, there are definitely people out there who are using Bitcoin to pay for things, even food. Maybe not so many right now, especially with the price fluctuations, but the number of merchants accepting it is growing, and for some of those who really believe in the technology, its a matter of principle or convenience.
What I mean is, there is nothing wrong with treating Bitcoin as an investment, but also it is a bit limiting to only see it that way, especially when you consider its original purpose.