While some of the wilder takes on it would prove a little too optimistic -- the scaling problem, in particular, seems intractable -- in many ways it was still a success. You can carry $10 million across an international border in a brain wallet, and if you do it just right, there's no way for a government or similar actor to even know. It's very hard to estimate something like this, but I've seen estimates in the $20 to $150 billion range for 2019 or 2020 for the volume of Bitcoin moved for the international drug trade. This is Bitcoin working exactly as intended, of course.