Sleazy things in the past?
In the past as in last month, when I got one yet ANOTHER of those endless "I'd like to add you to my professional network on LinkedIn" spams?
As in last year, when LinkedIn's site was hacked and 6.5 million passwords dropped on the Internet, yet according to Vice, "LinkedIn never clarified how many users were affected by that breach" (turns out, about 18 times the reported number)
https://motherboard.vice.com/read/another-day-another-hack-1...
Or do you mean the last few years, as when LinkedIn paid a (paltry) $13 million to settle a lawsuit claiming they damaged people's reputations from their irritating emails and deceptive practices?
http://time.com/4062519/linkedn-spam-settlement/
http://www.mirror.co.uk/news/technology-science/technology/l...
Do you really think all of LinkedIn's members were fully aware their contact list was being harvested and had knowledge and consented to that list being used for spamming? Clearly not.
IMO, LinkedIn's only positive contribution to the world is making it easier to spy on spies: https://icwatch.transparencytoolkit.org/