Women are less likely on average to push for payrises aggressively. This is a common phenomenon. Just because there is a mechanism at work though, that doesn't assauge their responsibility to ensure that their workforce is fairly and equally compensated.
One good way to tackle this is transparent salaries. Publish, internally in the company, exactly what salaries everyone is on. This empowers workers to negotiate on much fairer grounds.
Does Mono have any purpose any longer? What is the point now that dotnet core is so well-established?