Like many commenting here have stated, obtaining your managerial level references is a main objective. They then send your contacts LinkedIn invitations to grow their network.
Contacted one person and I did not even provide their contact information, so meeting a quota. Never heard back from the original girl, and the position they mentioned to me was not an open position as I know people in that company. Sometime later received another call from them but this time a different person with a different fake job. Did not call them back as it's a waste of time.
Again, another young person just out of college. I'm sure they sell your information as soon after I provided my information to the first person, I started getting many emails from different placement groups.
Looked up some of the names on the emails and could not find them online, so click-bait it seems. Overall a scam for your information.