Or they join with the stated aim of posting what they want to. Because there's no-one who can delete what they post, nor is there anyone who can tell them off that they have to listen to.
It's an interesting aspect as Search Engines rating of pages/sites/authors is affected by references on other sites. So more links to a page on other sites the higher the page appears in eg Google search results. It;s why some SPAMmers add links to eg gambling sites on unrelated pages, not because forum/blog readers are going to click thos elinks but that the linked site gets higher prominence in search results.
So quote a trolls links to Twitter far right twitters and those X-nutters get higher prominence on Google/Bing search results.
I have a personal website and although it has nopthing to do with Google, their search system indexes it and check and it maintains collected data about sites linking to my site and individual pages on my site; I can even get a list of such links or summary stats eg excerpt from Google stats for my feeble little site
So quoting troll's far right drivel from X just helps those far right posters gain "credibility/ prominence in search engine results.
Ian