on the other hand - I can't imagine I'm the only person to have been getting quite a few "come work for us" emails from Amazon via LinkedIn recently (two in the last month, six in the last year). The solicitations do not appear to be very carefully targeted - they seem to mention everything from machine learning to mobile app development.
I figure it's similar to applying to colleges. Stanford, Yale, etc send you info packets and ask you to apply but then reject you. Although some schools figure that if it takes $20 to acquire someone's attention and get them to apply to you (and pay a $90) fee then they can pocket the $70 (minus reviewer expenses) and look more exclusive when it comes to acceptance rates, but that's not the case with companies.
I get so many solicitations from recruiters that clearly didn’t look at my profile (i.e. “looking for Java architect” and I have zero java experience) that I’ve started reporting and blocking them.