Who is calling Bitcoin an investment?I`ve never seen anyone calling it "investment" so far.

People will continue to see btc as an investment opportunity,because of the price volatility and huge expectations for 25K or 50K price next year.You can`t stop them from buying bitcoins.
There is freedom of speech and opinions,you can`t create censorship.
it seems to have become human nature by buying something cheaply and it will be sold when it feels lucky, it must happen to all business people, and it happens not only on bitcoin alone, but to all cryptocurrency currencies. because most countries still consider bitcoin to be an asset, but if there are many countries that legalize bitcoin to be a direct means of payment certainly business actors will argue otherwise, and they will buy it without feeling as an asset but as a means of payment.