Prohibition of some currencies

🚨 Prohibition of some currencies

Sometimes I read followers asking if this currency is forbidden or permissible?

Honestly, I do not know, and at the same time I am against prohibiting something without clear legal evidence, because the currencies that are said to be forbidden, I searched for a reliable legal source and did not find anything, just people's efforts..

Let's assume that in his work he finances and supports an illegal activity, we do not disagree on prohibiting it, or for example, he works to finance gambling or usurious activities, all of these activities are forbidden without a doubt and without asking a legal mufti..