[frfl]

It's to de-emphasize post bodies. It's like that for all post bodies on HN. I believe the rationale was to focus on the title/link and any comments.

[Tempest1981]

For me, the title is also gray:

"Ask HN: Germans, how to work legally remote?"

[majewsky]

I think that's the styling for a:visited. (It links to itself.)