This puts parents back in control of what their kids are consuming. Without laws like this, it’s extremely difficult for parents to supervise and control their children’s media consumption.
I get that in theory a kid could sneak off to use TikTok/Instagram on some friend's device away from home, but that's not what's happening. Parents are handing their kids smartphones with unrestricted access to these apps.
People here keep coming back to the social pressures of not allowing their kids on these platforms. It's one thing to give them a device for being able to keep tabs with locations and being able to get in touch with them, but once they have a device where other parents have allowed their kids on the platforms your kid will be made fun of for not being on there.
The parental controls the platforms put on there are non-existent or a mere joke at best (as the recent post about TikTok suggesting porn to minors illustrates). So a parent trying to do things then gets accused of "damaging" their kid by being over restrictive. So, again, what's a parent to do?
A kid won't be ostracized for not having a TikTok. I survived not being on Facebook when it was big in middle school, despite a relatively few dull kids making fun. The same will apply to drugs or gambling by high school, so best learn to deal with it. There are lots of good ways to be popular. Unless of course it's a really bad area, in which case your kid will get beaten up for almost no reason anyway.
But plenty of parents are addicted to TikTok as well. In which case, wouldn't surprise me if they think the kid needs it too.