> > The ID presented at time of purchase does not have to be the ID of the actual user of the card

>In some EU member states this might be fine, but definitely not all

It seems hard if not impossible to prevent or stop?

Thought experiement: you can buy and register a car, and then lend it to someone else to use.

That's certainly "hard if not impossible to prevent or stop" and might seem fine ... right until the point when it isn't fine any more.

At which point the police will come to knock on your door (first).

You can anonymously buy top-up vouchers in supermarkets for pay-as-you-go SIMs.