Since when did forums finely tuned their addictive homepage feed based on votes, comments, and overall "engagement".

This is a social media news feed-style website. Like Reddit, or old Digg.

Since always?

Every forum I can remember shows the most popular threads first. Even 4chan does that with thread bumping, the most engaged-with threads sort to the top. Given the hyperbole of the times, that counts as "finely tuning their addictive homepage feed."

Hacker News, like Reddit, is both a forum and a link aggregator. It has features which are designed to influence you and to be addictive. And I promise you that people are as addicted to HN as others are to Facebook, Twitter, TikTok etc.

Yes I agree that it is addictive, and will be subject to this NY state law.

When I think of "forum" I think of pre-Web 2.0/social media like PHP BB. I don't think they would be categorized the same way.

That's what I meant too. PHPBB forums and the like had plenty of features that would be considered "addictive" in the modern climate, as well as "algorithmic" feeds.

They certainly could be categorized the same way. I don't think they will only because the political will isn't there and such forums aren't popular enough to matter. But if regulation of social media causes those forums to resurge in popularity then that might change.