Every time I logged in it would ask "Do you want to find new connections from your mail list?" Every. Time.
One day it stopped asking. Week or so later I got a suggestion for random people I emailed once years earlier. Got curious and checked settings and saw it was connected to my email contacts.
No idea how, maybe I accidently clicked it? Maybe they decided they knew better than I did. Whatever caused it I closed my account that day.
Couple years later (I think?) MS purchased linkedin and I smiled to myself safe in the knowledge it was only a matter of time until MS ruined it and every abandoned the platform. I was mistaken on that one.