> I'm generally okay with "how old are you?"

It's a foot in the door. Once this question exists, the next logical one is "prove it".

Same with digital IDs (for example the EU one), where you'll have to install it to provide a "zero knowledge" proof today, and since you already have everything in your phone, it'll be easy to implement the "real name" policy when registering/commenting/etc.

I'm not aware of any EU project to make a smartphone literally mandatory (instead of just convenient). If they do, I'll buy a separate smartphone just to hold my ID.

But you don't have to use that? They still issue ID cards

Ok but my phone already asks me for my name, isn't that bad too?

If you leave it blank or otherwise don't answer does it restrict your functionality?

But anyway it's not really the same thing until and unless governments start making motions to collect a legal name. And even then it still provides some general utility to the user which providing an age doesn't (unless you're setting up the device for a child ofc).

Does it require you to prove your legal name?

Isn't that the next logical step according to your logic?

It asks for a name.

And an age

Yes.