Governments are more likely to outlaw the possession or use of something rather than "get their hands dirty". There is already a framework in place -> "Say it"/Legislate -> Let "authorities enforce it".
It's virtually impossible that all governments get together and outlaw it. And it's not even like with drugs where it can be argued that they are harmful. So there will still be plenty of countries in the world who wouldn't outlaw or heavily regulate it and they will thrive, while others will miss out.
It's enough to claim "only drug dealers, terrorists, and pedophiles use it" and randomly search computers of people who use it to make it sufficiently unattractive that it never reaches a critical mass of users.
It's not enough, because it's money. When it comes to money, most don't care what it smells like. That's why it's so unstoppable.