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Considering those gamblers as investors can be from this perspective: the gamblers gamble on the casino and if fortunate to win any of the game then he or she go home with profit, this is likened unto ICOs, IEOs and the latest Defi platforms, investors also loss. Conclusively, what can generate profit and loss is called investment.
As far as I know, no one is going to call them as investors just because they won a lottery or even in a casino game.They wll be just referred as gamblers because they made money from their fortune not with any of their skills.Investing on ICOs or any new startups is like gambling with their money but it doesn't mean both these things are same.