If you think these guys were using shady and scummy tactics before to spam you and steal your contacts, what do you think they are going to do when their share price sinks? Suddenly reform and stop the borderline-illegal stuff?
LinkedIn will get even more aggressive at monetization. So expect even more of:
1) Random clicks that let you "invite" everyone in your address book
2) Incessant daily nag e-mails - "Complete your profile"
3) Blatant Man-in-the-Middle attacks for stuff you browse on your mobile
4) Data harvesting and selling even more stuff about you
5) etc, etc, etc
If ever there was a market ready to be "disrupted" this is it. Google could have done this with G+, Twitter can do this today with proper reorientation, Heck FB could wipe the floor with these jokers (WhatsApp could too).