Funny, but I (and I believe many who support this law) would say that's a good thing. The problem is not (and never was) social interaction online, it is large corporations designing their algorithms to be as addictive as possible to tie kids as early as possible to their services.

I have had to recently get back to using Facebook (after creating the account ~15 years ago and leaving it dormant for >10 years), due to several sports clubs using it as their only means of communication. It's scary how good these algorithms have become, I often only want to look up something related to the club and end up being roped into 1h of doomscrolling. And I'm an adult with significant better impulse control than most teenagers.