It is not about "advantage" but the usual security theater:

https://www.computerbild.de/artikel/cb-News-Handy-Prepaid-Ka...

The header makes it pretty clear "Danger of terrorism! Lawmakers tighten restrictions on pre-paid SIMs". That is of course useless nonsense, but politicians can point at it and claim they did something. Also, something, something, stones, glass houses.