It's been suggested it was a vendetta of CUSU's members who are active in women's union. It seems also to have a great deal to do with Sarah Brown, who is a Cambridge city councillor, so it wasn't just students.
But, I do think CUSU might have felt this way on their own. I think, from looking at their website, they might well feel that someone who criticises the word 'cis' is someone who should not be allowed to speak.
I don't think that's good, but I accept they're entitled to write open letters (it'd be absurd not to).
What I do not think is ok, is the way I have heard this represented: either 'evil transphobe woman threatens us all,' or 'Cambridge [town? university? students, many of whom probably don't know this is happening?] has no-platformed a feminist who spoke out on trans issues'.
Neither is true.
She spoke about internet abuse, which is important and which she obviously knows a lot about. She wasn't trying to speak out on trans issues, and she wasn't no-platformed. It wasn't even a university event!
I'm sorry if this isn't terribly coherent - I just feel that, once again, what is happening is that groups of women are being pitted against one another.