Just thinking out loud, but the problem I see is that even if you define Bitcoin as a scam, it could very well have been created by Satoshi Nakamoto (or the group behind the name) in good faith. The real issue now lies with the responsibility of companies like BlackRock to clearly and transparently identify what they are selling to the public.
It is also different than a casino: "Even if crypto investing is considered gambling, there is a factor not present in traditional casino games: the time variable of holding. Holding roulette chips has no effect on their value, while in crypto markets, prices change in time. By holding crypto assets for a longer duration, investors can potentially benefit from market fluctuations and price appreciation, making it a unique aspect compared to classic gambling games." [1].
It is also different than a casino: "Even if crypto investing is considered gambling, there is a factor not present in traditional casino games: the time variable of holding. Holding roulette chips has no effect on their value, while in crypto markets, prices change in time. By holding crypto assets for a longer duration, investors can potentially benefit from market fluctuations and price appreciation, making it a unique aspect compared to classic gambling games." [1].
[1] https://www.coinfabrik.com/blog/the-science-of-crypto-asset-...