I didn't say it was a necessary condition, I'm saying that those are the typical ways in which social media sites are designed to be addictive, and this site lacks all of them, so I'm wondering how it can be said to be intentionally designed to be addictive.
"Internet points go up" is the most basic of basics when it comes to making an addictive website, and this site definitely has internet points.
It doesn't need to be personalized to be addictive, in the same way that tobacco is addictive without personalization.