"diversity streams" is the term I prefer, since it's about under-representation in specific spheres of activity (which should be more diverse).
This context, internet anonymity, is rather an odd case - we're discussing the advantages of hiding in the crowd, by masking your identity as a member of a stream. I'm still using my preferred language for similar political problems involving the diversity streams, because I think it's the most appropriate nomenclature.
Well, I've never been sympathetic to the language and politics of "diversity", but I think it's especially, gratuitously inapt here. I suspect very strongly that women and men are present on youtube in comparable numbers. Youtube has mass awareness.
The problem discussed here has nothing to do with representation in specific spheres of activity; it's driven by specifically being female in the presence of men. Women walking by men on the street get catcalled, even though walking on the street is open to, and participated in by, all. The female commenters you mention are not trying to hide their "diversity" status, they're trying to hide their female status.
This context, internet anonymity, is rather an odd case - we're discussing the advantages of hiding in the crowd, by masking your identity as a member of a stream. I'm still using my preferred language for similar political problems involving the diversity streams, because I think it's the most appropriate nomenclature.