Not just recruiting, but evaluation and screening as well. Most people here are probably only looking for high-paying white collar jobs but Indeed does a huge business in front-line and blue collar postings. Now they're offering screening between application and in-person interviews and can take care of a lot of the filtering work that used to mean a huge pile of resumes. I see the GD purchase as breadth while they're also moving up & down the HR pipeline simultaneously.

Recruit is kind of a funny setup - itself it's not that large (I think around 800 people) but it owns/controls companies totaling tens of thousands of employees worldwide.