Regulating specific interfaces that have been shown to be addictive is the same as regulating specific classes of drugs. And it’s not like we have a plethora of variants of interfaces that have been equally discovered to be toxic. They are finite and enumerable as they come up.

If they have a set of characteristics that line up with social negatives, they should be disallowed or not permitted for persons under N years old (like for gambling or smoking). This doesnt solve the problem for adults of course, but its a good compromise.

I would very readily be in favor of outright banning infinite scrolling video feeds, even if its just for under 18s

Look at video games and you'll see the surface area of "addictive design" is basically infinite. People have gotten addicted to a huge variety of games, with not all that much in common.