Equality of people is not a rule of nature. In fact, some individuals are born with Down Syndrome and some are born Einstein. Some are born tall and some are born short.
Equality in the average income of different ways of grouping people (gender, race, religion, country, state, height, etc) are also not rules of nature.
Just because the outcome isn't equal doesn't mean there is discrimination. This paper had to start with the assumption that there wasn't discrimination (after all, it's an app).
I wish those analyzing every situation where there is an unequal outcome between groups also had to start with the assumption that there is no discrimination until there is evidence for discrimination. Unfortunately, discrimination seems to be the default answer for unequal outcomes between groups, even when there is no or limited evidence for it.
A few months ago, I shed my last hope of working for someone else ever again. I gave my resignation, and I am now the captain of my own small ship.
My clients respect my expertise, I respect their money.
Which might mean that women move on to better paid jobs faster than men, right?