I went checking the terms and conditions and it is true that they do mention internet gambling as one of the prohibited activities.
Thing is, gambling is allowed in my country of residence.
Plus, the gambling sites I use are big known names, with valid licenses, not shady casinos.
My question, what's the regulation about online casino in your country? what's the criteria of legal and illegal online casinos? if possible is there any list of legal online casino in your country.
You have to know that, if you country allow gambling and the gambling sites allow your country to gamble, that's not enough.
Anyway it's not surprising to see exchange prohibit source related to casino, just like how banks restrict source related to cryptocurrency, sometime they have ridiculous rules.