I have issue with readers who demand proof on earnings. Of course, people will question writers and it happens to all of us, but I don't think it's acceptable to demand screenshots. I don't understand what the motive would be behind lying about earnings, or lack thereof.
It really upsets me that even you, someone who has made a HUGE impact on Medium in only a year (I had no idea you had done all of this in only 12 months!) feels pressured to post these.
I would just have taken your word for it, but I felt like the earnings were irrelevant in your previous post anyway, it was more about not being able to share your work from other platforms and being labelled as spam. I think you are an individual of high class for even having taken the time out of your day to do this, but I don't think you need to.