In my humble opinion: anyone optimizing for "engagement" is trying to make a product inherently addictive.
Having a great product is not, but designing your product intentionally so people spend more time with it, than they wanted - intentionally not just let them write that one message, but distract them into other stuff - would qualify.
How would you prove this? What if the product was not intentionally designed to be engaging but ends up being more engaging than TikTok?
> Having a great product is not, but designing your product intentionally so people spend more time with it, than they wanted
So Netflix, Youtube, basically all ad based websites and social media should be hit with the same requirements no ? Even the news try to get engagement - it's usually not like they really care about honest and facts based reporting.