Sounds like you’ve just described any typical financial market to me.
Big difference.
Shares in a company that actually produce something have a tangible worth. The stock market may rise and fall, but if you own shares in, say Hovis, they still sell bread and make a profit doing so, with which they can pay a dividend to share holders etc. People will always buy bread and there is a tangible value add to baking.
If you buy Bitcoins, you own nothing. There is no inherent value, no work done, no value add, no profit produced.
The only reason people buy Bitcoin is they think they can sell it to someone else for more money in the future. The only reason that might occur is if the buyer also thinks it will be worth more in the future. A huge house of cards based on nothing but confidence.
People will always buy bread.