Worldwide, lots of people.
There's folks in Venezuela and Zimbabwe who need Bitcoin because their national currencies are hyperinflating.
There's folks in El Salvador who need Bitcoin because it is their national currency.
There's folks fleeing Ukraine who need Bitcoin because their nation is at risk of being swallowed by a large empire.
There's folks in Russia who need Bitcoin because their nation is doing the swallowing and getting cut off from the world financial system as a result.
There's folks in China (and other countries) who need Bitcoin because their nation can't be trusted not to interfere with private property and it's good to have a little insurance policy on a thumb drive, piece of paper, or memorized.
I think that cryptocurrency is one of those areas where people in the developed world look at their own life experience and think "Who could ever need that?", not realizing that they represent a tiny fraction of humanity and that the experience of most of the rest of the world is dramatically different. I work on a product (Android) with about 3B users. I work on a tiny segment of it (tablets & TVs), with about 12% market share combined, and we're always struggling to get the larger org to invest in developing us. But when you run the numbers, you realize that the 12% of Android users with a tablet or TV is about 340M, more than the entire population of the United States. Similarly, the number of mobile phone users with accessibility needs (largely vision difficulties) is also larger than the population of the United States, yet it's awfully hard to get people to consider screen readers and assistive technologies when developing.
Americans in general are wildly unaware of what a tiny percentage of humanity they are (for reference: about 4%), and this comes up over and over again in HN threads.