The most popular websites in the U.S. where users share content are Facebook, YouTube, Twitter, Instagram (Facebook's subsidiary), Reddit, Twitch, then arguably Imgur which is more a hosting site of images for other services, and maybe even iTunes for podcasts. You can monetize your content on most of these sites but if you get banned from say YouTube, your audience just dropped from the whole country to say half of the country. To compare to the real world, imagine if you were banned from speaking where half of the country lives. Besides the fact you can't get your message out even to those who want to hear it, but that your income is earned from speaking and now you can't reach your audience. These are real concerns for most content creators now that their voice and livelihood relies on these services. There is a point where we can decide these companies have too much control. Whether it be by site visits, % of total internet audience, or number of accounts/reach... YouTube has more accounts than the entire population of the U.S. Maybe that could be the threshold where we consider a company should be a 'public forum' or subject to meet certain free speech standards/regulations with their policies.