I don't know how the millionaires are being counted, but if you include property values then a lot of people got there just by keeping their house for a few years as prices shoot up. It doesn't necessarily do you much good if you have to pay as much when you want to move, but you can pass it to your kids eventually.
Hive is competing with lots of other coins and other ventures whilst not getting the attention it deserves. I wonder if it will boom in places like Venezuela and get to at least hundreds of thousands of active users that way. They may not have much to invest, but a thriving economy adds value. Elsewhere we have to overcome scepticism about crypto driven by well-publicised scams and hacks.
Plenty of challenges on the road to success.