Access to e-mail contacts is part of the sign-up process.
It is not really harvesting if they ask your permission.
People can opt-out.... but some of my contacts did not do so.
For what it is worth: I removed the e-mail address for the screenshot below. That made the Continue
button inactive. I could not just type or paste the e-mail address back in. I had to go back and complete step 1 again before I could get past step 2 (without skipping step 2). I should have just edited out the e-mail address using Paint :-)
Even though you asked your question of the OP, but I'll answer it too.
I'm not a member of LinkedIn.