I think what some people fail to see is that preaching at an echo chamber is pretty much useless. If you want to serve some purpose with your speech other fellating yourself, then you're best off doing it around a contentious audience and even better on a contentious platform. Somebody posting right to far right news in /v/politics for instance is basically wasting his time. Yes, he'll get lots of upvotes and accolades, but hardly a single person left in that sub that isn't already absurdly biased towards support of such views. It's the equivalent of posting anti-Trump stuff in /r/politics. You could post the most illogical, incoherent rant against Trump there and get a million upvotes and accolades so long as the people in the sub don't feel they're being ironically made fun of. The point is they could not care less what's being said, so long as it confirms their own biases. Godfrey Elfwick is a literal example of this. That is him being interviewed by the BBC about the upcoming Star Wars where he derides 'Dark Raider' and the stereotypes they espouse in Star Wars like 'Dark Raider' (who is black of course) listening to rap music. His intentional insanity wasn't challenged once, because they thought he was 'on their side.'  You run the risk of censorship of course, but even that comes at least with one final benefit. When people who are collected and logical are banned, it puts a major spotlight on the arbitrary bias in censorship. And it also has to be said I haven't even gotten into market share. The big sites by definition have it - individuals sites and "freer platforms" don't.