Hell yeah, online crypto gambling is actually legal in a country where there are no gambiing laws, because by default, everything humanly doable, that is, any thing or activities humans can do or participate in, is by default legal, until the law declares it otherwise.

So, in a country where there is no gambling laws stated yet, and gambling being an activity humans love to engage in, it automatically means that, gambling is legal in that country, legal until the law is stated, making it officially recognized as lagal, or banning it and making it illegal.

It's like crypto currency trading right now, in countries where there are no crypto currency trading laws, trading crypto in such countries is legal by default, until the government come up with a law either making it officially legal, or banning it, which means it has become illegal to trade crypto currencies in that country.