It's how we get websites that are "legally required" to look over EVERYTHING that you do, at all times, and have robots judge if you are being too mean or not, just so that they can say they are putting in an effort.
That sounds ridiculous until you realise that they already do it. They decide what to show in your timeline by looking over every post and matching what they think you'll engage with most. They know exactly when you're being a dick, what posts to show you to encourage or discourage that behavior, who to show your posts to, and so on. Adding a box to say "this post looks pretty bad, maybe take a break now" wouldn't be difficult. They don't want to do it because negative shitposts make them money.
TikTok in fact shows you a video of a man saying “woah you’ve been scrolling for a while. Maybe you should take a break” after like an hour. So it’s totally a doable thing for them to interject and suggest a break.
Like you said, they review every post already. The tools are there they’re just being used for the wrong goals.
That sounds ridiculous until you realise that they already do it. They decide what to show in your timeline by looking over every post and matching what they think you'll engage with most. They know exactly when you're being a dick, what posts to show you to encourage or discourage that behavior, who to show your posts to, and so on. Adding a box to say "this post looks pretty bad, maybe take a break now" wouldn't be difficult. They don't want to do it because negative shitposts make them money.