For example, from a US-based perspective, a "positive" is that law enforcement agencies and the thousands of social media monitoring tools they utilize look at Twitter and other big platforms. LEO agencies have had for years the channels to monitor posts and request instantaneously from those companies supplemental information on the user or post that is being investigated. LE will be out of luck if they were attempting to immediately investigate a user on an obscure white supremacist forum hosted in Russia. That website owner and its servers would not be in jurisdiction to respond to that request.

Also, please see my other reply 1 minute before yours regarding private companies being able to ban, suprress, etc. I agree with you that private companies can run their own ship how they please, whether in the best interests of profit or ideology.