On HN, at least, once I get a few pages in I usually realize I’m just seeing articles from a few hours/days ago. I know then it is time to take a break.
It isn’t infinite the same way TikTok will or YouTube used to keep playing something you haven’t seen yet.
Things like hn or old.reddit still carry most if not all of the negative effects of infinite feeds.
What I would give credit to hn for is that being text only, it forces you at least to think a bit and not blindly consume a video for example.