The text of the Third Circuit decision explicitly distinguishes between algorithms that respond to user input -- such as by surfacing content that was previously searched for, or favorited, or followed. Allowing users to filter content by time, upvotes, number of replies etc would be fine.
The FYP algorithm that's contested in the case surfaced the video to the minor without her searching for that topic, following any specific content creator, or positively interacting (liking/favoriting/upvoting) with previous instances of said content. It was fed to her based on a combination of what TikTok knew about her demographic information, what was trending on the platform, and TikTok's editorial secret sauce. TikTok's algorithm made an active decision to surface this content to her, despite knowing that other children had died from similar challenge videos, they promoted it and should be liable for that promotion.
The FYP algorithm that's contested in the case surfaced the video to the minor without her searching for that topic, following any specific content creator, or positively interacting (liking/favoriting/upvoting) with previous instances of said content. It was fed to her based on a combination of what TikTok knew about her demographic information, what was trending on the platform, and TikTok's editorial secret sauce. TikTok's algorithm made an active decision to surface this content to her, despite knowing that other children had died from similar challenge videos, they promoted it and should be liable for that promotion.