LinkedIn is not a tech company, it is a bunch of business people who hired technologists to build a website.
Sure, lots of good tech has been open sourced by LinkedIn employees, but none of them sit in decision making capacities (or Intro would not exist). THAT is the culture problem.
As a fairly technical person, I think Intro is a fairly neat product. There's definitely some implementation issues that mean that I'm not going to use it (I don't really want a linkedin advert in all my outgoing email), but I'd imagine it'd be pretty useful for some people. I already trust one large corporation with my email despite the fact I know they don't have my best interests at heart. Adding another one wouldn't be a deal breaker.
Besides, even if they aren't in the positions of authority, technologists can still be culpable. I thought we already had enough examples in history of culpable people who were "simply following orders" to render such types of discussions moot.