[mschuster91]

> They are known for negative about banning copyright violation or controversial contents (than competitors)

They're required to do the former (and Switter) by American laws, and for the latter: they banned the Daily Stormer, 8chan after a terrorist incident, and Kiwi Farms after their members called for open violence. It's not hard to see why these three got banned, inciting violence is not covered by "free speech".