Is there a precedent where this happened organically and the same similarities were in place in that many legislations around the world inside of half a year?
That was openly coordinated beginning with the Montreal Protocol. Those things work top to bottom with international accords in the beginning and don't suddenly pop up left and right inside of much less than a year. Getting a ban on lead in fuel took ages with Europe implementing it a decade later.
These kind of laws usually take many years to hone down just right and talk to all parties involved. Unless some lobby group presents a finished piece of work that just has to be waved through, like with the Citigroup scandal.
People have been talking about social media bans for quite some time, this isn't something that just showed up out of the blue. It's a problem that's been worsening for years.
Then you had the Covid years where kids ended up spending a lot of time on phones and tablets, hence social media, and everyone is seeing the myriad of problems coming out of it.
Sometimes it's not a vast global conspiracy, sometimes things just suck. Also, sometimes things suck and particular groups use it to get their way, that still doesn't diminish the thing that sucks.