Earlier quoted context omitted.
You seem to be projecting onto me what you think I'm projecting. ;) I didn't call it a stronghold. There are certain subreddits that were aligned. The donald before it moved, conspiracy, conservative, etc. You ever see the greatawakening subreddit where they were acting like Trump was giving secret messages in speeches and calling for executions? If that exists on a site with leftism as a major demographic, what does…
I don't believe I am, though--you are, if I'm not mistaken, asserting that it's some prolific iniquitous undercurrent which these platforms are subtending in some manner. (Which would seem somewhat misleading to me, as your assertion that r/TheDonald moved was of their own volition, rather than a banning by the site.) Any platform harboring content will, as a matter of course, simply through the caprice of a moderato…
However, if allowing certain discussions means also allowing other discussions, I'm not broken up if sites like reddit were to ban a subreddit like conspiracy or at least try to reshape it to something much more objective.
If the owners a property decide certain views are abhorrent, that's their right, I can't think of a valid moral or legal complaint against that - it is their property. If we lack competition that is an issue of market competitiveness more than propaganda.