I don’t think gambling has reduced in Nigeria, it’s possible that people are no longer visiting bet shops like they used to, but you can’t be certain that they are betting online which is more convenient.
Only a few persons still pick interest in walking down to a betting shop to book a game and place a bet when they can do that while sitting in their house. Before, I would say online gambling was not as popular as it is today, now that most of our local casinos have also made it necessary to provide a friendly online service. Many have moved to that area, except for a few of those who don't have smartphones and the ones who still choose the old ways, coupled with the ones who can't operate a smartphone.
As for bitcoin reducing crime, I think it’s possible but I doubt it has a significant effect because the people who are benefiting from bitcoin right now are mostly literate and wouldn’t have turned to crime regardless.
Not all literates think alike; we still have those who are well educated but have made peace with crime and give blame to lack of job opportunities. We have a famous local thief in my community who finished with a second-class upper in accounting; a few years back, he changed his line of crime into what is now indirectly turning into a legit hustle in some homes (internet fraud), where he claims to be putting his brain into good use.
