[mr_mitm]

Your assessment is spot on, but for whatever reason it's extremely popular with amateur physicists. The HN crowd likes it a lot, too. Almost every thread about dark matter has at least one comment that goes like "I'm not a physicist but dark matter always seemed like a cop out to me and will go the way of the luminiferous aether". I'm surprised that we're not seeing them here, perhaps because MOND can't explain this.

[daxfohl]

And yes, hot dark matter has largely been ruled out, but there are still extensions into warm dark matter and ultralight dark matter that seem more manufactured but are still plausible. The observations in this paper creates some additional challenges for those theories.

But yes, CDM is what most researchers expect, by a large margin.