They use a different process to achieve 7nm equivalent resolution. Intel itself is having problems at 10nm and below, currently it appears that only TSMC is in a position to mass produce at this level and they've got the problem that a lot of their product goes to ...... China.
A lot of this really fine geometry is specmanship -- it just represents the smallest feature on a chip, not every feature.
As for 'stealing information' its really not that simple. I know that back in the day the blueprints for some secret naval installtion would be stolen and Sherlock Holmes or Piorot or whoever would recover them but even then there's a lot more to process knolwedge than a simple file or two. Everyone knows roughly what needs to be done but doing it, and doing it repeatedly and reliably on a large scale, requires a lot of institutional knowhow, the collective knowledge of a lot of people.