I interviewed with Apple for a research and development related position a few years ago and although the process is notoriously shrouded in secrecy and n-levels of NDAs, I noticed the interview began to shift from assessing my technical ability and team fit to prying for information about a very specific set of technologies I'd worked closely with. Those technologies had some odd turns of events with shifts in private IP ownership no one seemed to know about, including leading industry competitors I spoke with.

Perhaps I'm paranoid but it felt like Apple had purchased some of those private technologies and were wasting my time with a bogus interview prying for information about what I knew of the system before the IP mysteriously changed hands, likely because I had more levels of access to something they wanted to commercialize in the future. I haven't seen anything pushed to market yet but I've seen some semi related products creep up recently.