So in other words, LinkedIn's "premium account" service suffers from an info disclosure vulnerability that they seem to be either too lazy or inept to fix, and are instead just using their legal team as a meatspace firewall.
"meatspace firewall" might be the best term for a cease-and-desist lawyer I've ever heard. Well said!
I do not believe this is an exploit on LinkedIn's side. They're just pinging to see if various email addresses derived from your name exist. Maybe a few Google's too.
No evidence of a LinkedIn vulnerability yet.
Features that are supposed to be behind a paywall but aren't? That's a vulnerability if you are LinkedIn and want to encourage more users to upgrade to premium.
Admit it. You only commented so you could type "'meatspace' firewall". me too.