Your profit came at someone else's loss, though. Gambling at a casino and winning means the casino loses money. Gambling on crypto is essentially taking money from other people, who may be gambling addicts, or suckers that have been fooled into buying crypto "because it's a good way to hedge inflation".
Casinos aren't legally allowed to tell anyone they're "investing" their money with them. When you are at a casino, you know you're gambling your money.
