You can also understand that there is a bubble in the bitcoin market. Indeed, many people think that the valuation of bitcoin is too high. I think the current encryption is very similar to the Internet boom of decades ago, when the Internet was also considered a huge bubble, and I believe the encryption community will emerge in the future a lot of valuable companies.
While I agree that the market of cryptocurrencies can form bubbles that does not necessarily mean that everything is a big bubble and that nothing has value, there are many cryptocurrencies that are going to be essential in the way we understand the future of the world and that are going to be used by everyone and when you take that into account the market cap is very low right now.