The evolutionary force is really just "everyone else showed up at the party". The Internet has gone from a capital-I thing that was hard to access, to a little-i internet that was easier to access and well known but still largely distinct from the real world, to now... just the real world in virtual form. Internet morality mirrors real world morality.

For the most part, everybody is participating now, and that brings all of the challenges of any other space with everyone's competing interests colliding - but fewer established systems of governance.