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Bitcoin does not promised you any profit. that is one thing for sure. So I kinda disagree with what you are trying to relay with your message. The thing that bitcoin have use cases such as payment method, it surely gives itself valuation. Besides Bitcoin is not controlled by any entity though it can be manipulated in the market which is not new since all stocks can be manipulated, even supplies of consumable goods.
The fact that Bitcoin had established its audience and the way to mass adoption is getting clear, I can say, it is actually fine to buy Bitcoin.
No investment promises profit, but every investment, except crypto, has end consumers who will eventually use or consume the resource in which it is invested. More importantly, without the end consumers an investment resource would not even exist. Only things that lure investors to put their funds into fraudulent investments schemes, have no end consumers. Bitcoin is one such thing. Nobody who put their funds into Bitcoin can consume it, like food is consumed by hungry people, dollars by borrowers, picture by art lovers or gold by jewelry industry. So the only possible way for Bitcoin investors to get consumable resources - which can provide an actual benefit to them, is if new investors enter the scheme. Now, you can call this scheme payment method, new internet, money, digital gold, ... it can be widely accepted, have its audience, large investors... or whatever, but none of this can change the fact it has no end consumers which renders it a Ponzi scheme that will eventually collapse.