I tend to think that it contributed to Trump's election, because it has the effect of creating massive polarization.
You can't segregate sites by viewpoint and thought filter everything in favor of one side or the other and expect it not to devolve into extremist conflict.
But the people doing this didn't want to admit that they caused the problem to begin with, so instead they double down.
Before them, politics was still very cutthroat but not polarized along party lines.
That was certainly a thing that happened, but as far as I know Rupert Murdoch never got Gore Vidal blacklisted by book publishers or whatever.
It's one thing to say your piece, something else to stop the other guy saying theirs.
Have to say — Murdoch has been remarkably influential as a massive negative impact on humanity
Talk about impact.
Truth is in the eye of the beholder
[1] https://www.npr.org/2018/08/06/636030043/youtube-apple-and-f...