This is a very enlightening post and and a unique way of presenting the opportunity from Steemit. I am from Philippines and I see that my country is the 4th in your list with 8.50 M people living below USD 1.50 or less per day. I was tempted to compare in terms of percentage the numbers in Indonesia compared to Philippines based on each latest estimated population for each country and I found out that my numbers are 8.4% for Philippines (Total Population 104.9 million) as compared to 7.4% for Indonesia (pop: 261 million). But again, it is wrong to interpret the number of poor people living below the USD 1.90 or less per day as a mere number in statistics.
My observation for Philippines (maybe it is also true for Indonesia) is that majority of those people that live below USD 1.90 do not have luxury to use the internet. Coupled with our slow and expensive internet, those 8.5 million Filipinos would be knocked out in the first round. I would like to relay that the average cost of one day mobile internet maybe about ~USD 0.30, so take that from USD 1.90 what would be left? I would say that those millions of people that are part of the numbers presented in your table would not care to use Steemit as they are busy looking to augment their income higher than USD 1.90 everyday.
Do not get me wrong, I love Steemit. This a very novel idea. I love it the first time I heard it from my daughter from the University. I immediately registered and was aching to have my account approve. This is my first comment ever and I hope to be more engaging to other people's posts that are relevant from my views.
My message is that, as of the moment I see that Steemit would be relevant to help the middle class and millennials. It would be too much to ask the author to make a separate study for middle classes as it would be more complicated. But this is as well eye opening and there might be another person who will continue the study. Cheers!