> My kids having a cell phone with basic phone and texting capability isn’t a digital sovereignty issue.

Of course it is, the first version of Twitter was a texting platform. You can't draw some line and say that this is the end of the baggage that comes with this convenience because that is not how the world works. The inevitability of social pressure means "keeping up with the Joneses" so your kids need to communicate with others, not just you.

Just because it doesn't come in the form of an app doesn't mean it is safe or come without risks.

Telecoms (calling and texting) are literally regulated utilities. I’m confused at where the baggage is.

I’m failing to see how Twitter is relevant.

I’m failing to see the “keeping up with the Joneses” factor here. I am talking about basic cellular service not a $1,000 iPhone loaded up with brain rot apps.