Why is Oasis banned?

Could you elaborate on the reasons behind the ban of Oasis? I'm particularly interested in understanding the regulatory frameworks and compliance issues that may have led to this decision. Additionally, I'm curious about any potential security risks or fraudulent activities associated with Oasis that could have contributed to its prohibition. Is there any specific jurisdiction or authority that imposed this ban? And finally, what are the implications for users and investors who were previously involved with Oasis?