Free exchange among peoples is alive and well. It is easier today to make a website and share anything than it has ever been in the history of civilization. All this is is the reining in of a few greedy corporations that offer information-sharing platforms in exchange for exploitation. New communities will pop up, and old ones resurface.
How are people being exploited? Where is the harm?
I believe strongly that the social media and internet ad business models are at best amoral but responsible for the second order effects, much as coal plants are responsible for pollution. At worst they are making money off of making people crazy by giving every crazy person a megaphone and making sure you have to hear from them.