I know this isn't a convenient response, but Shaun has been leading some concentrated pushback against BBC's transphobia for like a year. Check out some of his recent videos for a detailed answer. https://youtube.com/@Shaun_vids
ConstableJelly
It's just a way to subscribe directly to content sources rather than subscribing to a creator's social media account or a subreddit or something. So if there's a blog you like and you use your RSS reader to subscribe to that blog, any new posts will be fed directly to your reader. Obviously, the benefit then is that you have a central portal with a direct connection to all of your selected content sources.
Just to play devil's advocate, and full disclosure my only Lemmy account is on Beehaw, they're not doing this out of a sense of judgment, they're very explicitly trying to create safer, friendlier online community, and since lemmy.world has gotten so big with no signup gate, the moderation policy there doesn't align with theirs and is beginning to impact Beehaw. They claim this is very hopefully a temporary measure at least until there are more robust moderation tools.
That being said, I'll spend a little more time here on kbin to check out the broader community :-).
I can appreciate wariness toward the kind of tribalism you describe in your last paragraph, but in this case the BBC has actually acted irresponsibly, and you quoted one of the big reasons why from their own article:
#1, Get the L Out is not "campaigning on lesbian issues," they're campaigning on anti-trans issues. Their stated aim is not to improve the social status and wellbeing of all lesbians or something, but rather to exclusively define lesbianism for all lesbians in such a way that excludes trans women, full stop. From their own website:
Because of this, #2, the article is in no way and never was "a description of the problems within the queer community" (Get the L Out makes this helpfully clear in that the tagline of their group is "Lesbian not Queer." The article is, in the most generous interpretation, a description of a radical trans-exclusionary group's grievances deliberately obscured to masquerade as "problems within the queer community."
And #3, at least most of the respondents (to my recollection and again, self-selected from a group by definition pre-disposed to this grievance) had never felt direct pressure from a trans woman for sex, but rather felt pressure or fear of condemnation due to their own discomfort with trans acceptance.
There are actually many other issues with the article, and the BBC has dragged an anchor in making any corrections. I don't think this discredits them as a news source in general, but this and other examples do show a pattern of transphobia in the organization at large.