I understand your frustration, but I see what you call a ‘pyramid scheme’ in a completely different light.
Scammers can use anything available for their Pyramid scheme and scammers don't need to create their blockchain to attach scam ponzi scheme into that blockchain and related scam products. Bitcoin is for everyone exclusively scammers and scammers abuse Bitcoin for their Ponzi scams, or in other words you can say Bitcoin is a victim of scammers who abuse it for scam.
Bitcoin certainly started out as ‘digital cash’, and the excitement was great at the time. But things have changed over time. Now Bitcoin is not just seen as a transaction tool, but as a digital property or digital gold. Why? The future of the economy and finance is now shifting towards risk hedging, privacy and sovereign wealth.
Bitcoin has many use cases and utilities and fortunately, you can have it as a Digital cash, transaction tool, digital asset, and more. You are free to choose what to do with your bitcoin and no one can prohibit you doing this. With Bitcoin, if you use a non custodial, open source wallet from creation to storage, with private keys, you control your coins. Later you are free with many choices of using your bitcoin.
The bullish case for Bitcoin is a book that can enlighten you about Bitcoin. The link is for free access version on Medium, but if you love it you can purchase the book on Amazon and support the author.