um, I didn't make any claims about anything being driven underground in relation to the election. That was completely you Maybe you've confused on the timeline of events, or content that was monitored? You do remember that Trump got a disproportionate amount of media coverage right? And while some people think thats because of negative coverage, you have to remember that his followers don't hold any moral or politcal beliefs beyond "making liberals cry", just look at Lewk.
and you're commenting on a realworld example about how poorly groups transition from site to site. How many people did we lose coming from Atari? Sure, some of those people might have transitioned to other sites, but the more people spread out the less welcoming their views are and less expressed they become (this was actually covered in the research). The farther down the rabbit hole you go to find a welcoming platform the less and less people you reach.