Yeah, I almost mentioned Silk Road, but BTC has since been used to back trace and arrest online drug dealers so I feel like it was never really that good at it to begin with.
Google dorian satoshi nakamoto newsweeks. The guy is probably behind btc. He worked previously as army contractor and in the finance sector...
Just like TOR network was the work of 2 previously army contractors (I remember that quite well, even if wikipedia doesn't seem to remember as well).
Beside, Belgian and other CB (not even ECB) never had a thing to say about crypto with public blockchain of any sort. But monero, which has a private blockchain, has been prohibited in nearly all EU juridiction soon after its launch.