This is BS. Bitcoin generates profit from supply and demand.
Supply and demand is the mechanism of price discovery. The profit comes from buying low and selling high. This is known as speculation. There's no other way to profit from owning Bitcoin, aside from shitcoin forks and airdrops, that are rare and unpredictable.
And "speculative trading" is not the main use of Bitcoin. Sure some people use it that way too but it is ALSO used as a currency and savings account. Look Africa. These examples prove your "purely speculative trading" claim very wrong.
https://youtu.be/qvwqoYSani0Who said anything about Bitcoin use? It's a topic about the origins of Bitcoin's value.