Three years ago, Bitcoin was under $400, a price I thought was too high even then. As far as I'm concerned, Bitcoin has no intrinsic value and should be worth nothing. So why does anyone think it's worth thousands (and in some cases, millions) of dollars?
It's the theory of false scarcity. There are a limited number of bitcoins in the world and the usage of blockchain technology has assigned the ownership of each coin to specific wallets owned by individuals. So to take "ownership," I have to use the universal blockchain mechanism, accepted by all as valid, to transfer a coin.
I do not think Bitcoin and, in general, all crypto currencies are a bubble. With every bigger drop in the market, everyone hopes this will be the end, but the BTC and other coins return stronger. I think this time it will be like that again. In my opinion, more and more people are starting to believe in BTC and more and more people are entering into the crypto world.