This is where You are very wrong. I wont write down all aspects, that would take too long, but only main differences, what makes BTC a scam, while precious metals are not.

First: no other mining includes precious "deflationary" mechanism, that does nothing but lessens reward for same task exponentially. That is nothing else than pyramid, doesnt matter how You name it. It would be same, if Goldakatoshi somehow set, that after too years gold miners will harvest 2 times less than today, after 4 years 4 times less, then 8, then 16. You see how quickly it grows. So its fraudulent in its core.

Second: Gold can not be forked. There are reserves to mine, or there a not. Simple. Forking, segwit and lightning network are nothing but delay mechanism for winning time for scammers (mostly early whales) to cash their early free coins in. No body know ratio of produced coins and those which are cashed in permanently, because of very low transfer fees, whales can trade coins between their own wallets and give impression of any "market price" which they can find idiots at.