Looking back, the evolution of social media/youtube was pretty obvious. Back then, not so much.
1) Begin with anything goes including illegal. Run at a loss, Grow baby!
2) Ads
3) Bitching from some important people causes some removal of the more flagrantly illegal stuff.
4) Employees and PR departments apply a POV to what is now close to a monopoly. Large scale censorship.
What makes the modern era interesting is the POV angle. I can't imagine Rockefeller's Standard Oil restricting sales to people with conflicting politics. Of course, there are people spending a lot of time each day on r/politics and what used to be r/thedonald shouting joyous insanity at each other...that's the modern pool of workers.