How did the Ministry not catch the trio in Deathly Hallows?

Question

Given that

• The Ministry keeps tabs on people Apparating (according to JKR, interview quoted here),

and that

• the Death Eaters controlled the Ministry after the death of Rufus Scrimgeour in Book 7

how did the trio manage to travel by apparating from one place to another and not get caught?

Answer 1

As quoted in the accepted answer here:

"It's impossible to track anyone who Apparates, unless you grab hold of them as they disappear."

_{-Remus Lupin - Deathly Hallows - Chapter 11 - The Bribe}

So the Ministry may have been able to detect that Harry and co had Disapparated from location X, but they'd have no idea where they had actually Apparated to.