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> It's unfortunate that other media sites would never implement these features because their business model is entirely driven on people spending more and more time on their sites.

I don't know every social media site, but many of them do have built-in time limit functionality. It's even better documented than what's on Hacker News.

First two random ones I searched for (Instagram and TikTok)

https://help.instagram.com/2049425491975359/?cms_platform=ip...

https://www.tiktok.com/support/faq_detail?id=754359745915568...

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