I think what you are describing in your opening post has one flaw: You describe an asset that is sold to people for their fiat money with no real value behind it in return. This for Bitcoin ist not true, since bitcoins were not sold to people by Satoshi Nakamoto. He only created the network and let people do work (mine) to get the bitcoin. If satoshi would have just sold all coins to people and then left it would be a scam, I can agree with you. This is done by many premined coins but as I said was not done with bitcoin. So in order to get bitcoins you also have to perform work, which makes it in return also debt based. TADA: it is not that different form other currencies, except it is digital.
It's a scam in a sense that Satoshi in the Whitepaper claimed that his system produces money. Money is an economic resource from which people can benefit without new buyers or investors. Also, no one knows how many addresses Satoshi has in the system. So he is essentially benefiting from the disinformation written in the Whitepaper. He got real economic resources and left the holders only with units of his imagined number (21 million). Which is why literally all holders need the new buyers or investors to get the resources back. Without them, they are doomed. Hence, a classical investment scam.
I'm sorry but you are not understanding bitcoin correctly, since you are assuming that satoshi exchanged bitcoins for fiat money and then left. This is not the case since it is only recorded that he mined two blocks and one of them is unspendable. Meaning he owns 50 BTC in total and those were not spend also. Ofcourse he could have mined more blocks later but everyone could have done this so it is not right what you are saying.
Can you maybe tell what is the reason for you to fight random people on the internet about Bitcoin?