just-shower-thoughts:

In Harry Potter universe Ministry of Magic can detect magic use but can’t find Death Eaters this way. It’s probably because storebought wands are collecting and selling your data and Death Eaters are rooting & jailbreaking to remove MagicFacebook. Ollivander is the Mark Zuckerberg of HP Universe.

Nah. A more accurate analogy would be the scar horcrux, collecting and passing on information on Harry Potter to Voldy until Harry ‘rooted and jailbroke’ it by going to get himself killed.

The Ministry of Magic just detects magic AROUND wizard kids age 11-16 via use of a charm. If the kid lives with muggles, barring the presence of a house elf, it’s not rocket science to work out who used magic. If the kid lives with adult wizards, they’re exempt from the charm because the adults’ magic will interfere with it, so the adults are expected to keep the kid’s magic use under control. The Death Eaters being a) adult wizards or b) child wizards who live with adult wizards…