A press briefing published on their website reads, in part:
Certain people have recently been promoting OneCoin, said to be a virtual currency based on cryptography, in Belgium. The FSMA wishes to warn the public that OneCoin has not received any form of recognition whatsoever from the FSMA. The same is true of the persons who are promoting OneCoin: they do not hold an authorization or any other form of recognition from the FSMA. Generally speaking, there are no specific rules governing virtual money that the FSMA could enforce.
The FSMA didn’t stop there, of course, but went on to in so many words indict all cryptocurrencies, Bitcoin included, as “risky,” saying:
The FSMA wishes to remind the public of its warnings, issued jointly with the National Bank of Belgium (NBB) in January 2014 and in April 2015, and emphasizes that the risks associated with the use and the holding of virtual money such as Bitcoin which are mentioned in that warning are still relevant.
https://www.cryptocoinsnews.com/belgian-authority-warns-against-using-onecoin/