I don't necessarily think this as it is will "work" but I'm all for someone at least trying to do something. Yes, there are a bunch of externalities and potential second order effects that don't sit well with me but, at this stage, I'd rather some attempt at trying to regulate than throwing up hands and saying its all too hard.
Also, dont buy the this is the slippery slope to more authoritarianism etc. as an argument against it because if they're going to go down that path they would anyway whether they did this or not frankly
Anyway, it might not work 100% of the time, hell maybe even <10% but any additional friction to knock this kind of social media from being so ubiquitous is a small victory in my eyes
If you just want to try something that doesn't work, why not legislate touching grass every morning without all the downsides of a dumb blanket ban?