Why is BTC not a security?

I'm puzzled, why is it that BTC is not classified as a security? Given the nature of cryptocurrencies and their volatile prices, I would expect them to fall under the umbrella of securities, similar to stocks and bonds. After all, investors purchase BTC with the intention of profiting from its potential appreciation in value. Could you please elaborate on the reasons behind this classification? I'm interested in understanding the legal and regulatory frameworks that govern cryptocurrencies and how they differ from traditional securities. Thank you for your insights.