Earlier quoted context omitted.
You won't be seeing 30%+ gains when they're throwing people in prison for it. Most drug users are never prosecuted. But the threat of prosecution does very little to affect the quality of their purchase, relative to what it would do to BTC market as a whole.
Yeah, illegal things definitely don't end being sold above market price.
Outlawing Bitcoin (or cryptocurrency generally) would cause a huge demand reduction. Some coins might adjust supply to compensate, but total crypto "market cap" would surely plummet.