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The price goes down? Not a problem for you. You still uses it as a regular currency. It is just that you need to spend more of your coins to buy the same thing....
I doubt this, I don't think anyone is rich enough and generous enough to do this. No one buys bitcoin at $69k and will spend it when it costs $30k, even those who consider bitcoin a currency. That's a big deal for anyone.
Most people are here for the profit. So when the price goes up, the sell and take the profit. When it goes down, they reinvest.
This is true, many people are always propagating and telling newbies that bitcoin is not an investment, bitcoin is a currency and should not be viewed as a tool to make money. But even they see bitcoin as a tool to generate profits. Honestly, I've met many people who both use bitcoin for investment and use it as currency in some cases. But I've never seen anyone not for profit treat bitcoin as a pure currency.