No there isn't. These ridiculous numbers are made up by taking the last price a coin sold for and multiplying it by all coins. If I create a shitcoin with 1 trillion coins and then sell one to a friend for $1 I've suddenly created a coin with $1 trillion in "value"
I'm not sure the 3 trillion includes shit coin valuations. Typically volume and liquidity are factored in for any serious analysis. Your assessment of valuation is probably just as true for traditional currencies and stocks. I guess the main difference is regulation.
Good luck with the SEC when you open your exchange
It's 2025, financial crimes are legal
3 trillion is just the top 5 or 6
Unfortunately, the amount of money invested in something isn't indicative of it's utility. For example: the tulip mania, beanie babies, NFTs, etc.