Remember when LinkedIn was condemned because they copied Gmail’s login page saying “Log in with Google”, then you entered your password, then they retrieved all your contacts, even the bank, the mailing lists, your ex, and spammed the hell out of them, saying things in your name in the style of “You haven’t joined in 5 days, I want you to subscribe” ?
I don't know how they're still in business after that. They also had a massive data breach at one point.
The original version of the LinkedIn mobile app uploaded your personal contacts stored on your smart phone and SIM to their server (to also "invite" them), without requesting user permission.
After that, I never installed it again (but too late), and I bought a second (non-smart) phone.