It's interesting that Claude also over-uses en-dashes. It's very willing to create compound-noun-phrases, especially in that compressed-summary-paragraph it often writes. The 0-days-vibes-vulns that started this thread looks a lot like that, but it could be Claude directly, or just Claude's style influencing people who spend too much time with it.
Those are just hyphens, actually. En dashes are for ranges (e.g., 1–4, which is admittedly hard to distinguish from 1-4), not compound words. Point stands though—LLMs do love compound words and dashes in general.