While good parental controls are definitely lacking this feels like this doesn't really address the underlying issue and at best simply restores some aspect of "VHS and Cable TV" parenting of the days of yore. Perhaps even worse since it doesn't seem like it would instill any resiliency to the very effects it blocks, as soon as you remove kite from your child's path would you expect them to remain steadfast or immediately revert to that addiction?

Marketed as a next gen ad-blocker I could see more utility.

On the directly harmful side seems like you could ask it "hide all posts from an opposing viewpoint" to help people create echo chambers.

From a product standpoint, general purpose first-party browser agents (from Microsoft/Google/Apple) might eat your lunch. Though if you get far enough fast enough you might get bought out! ;-)