Reddit is plenty addictive in my experience, and I've heard the same from other people ranging from high school teachers to tradespeople.
i think most users need more screen blocking control than they get out of the box on iOS. tools like one sec [1] have been invaluable for me.
[1]: https://one-sec.app/
Hackernews is also addictive. Fortnine is addictive. World of Warcraft is addictive. NFL is addictive.
Addiction does not strike to me as a unique trait of the social media.
The echo chamber bubble on the other hand, seems quite unique.