[davedx]

For me there are a few reasons:

1) Google has a proven track record with email and email security (Gmail) over many years now

2) LinkedIn has a bad reputation for security

3) Most of the people I know who use LinkedIn probably wouldn't even have thought "how does this work". I don't like that any company can "get away with" something like this that could put so many peoples' jobs at risk. It feels shady and unfair.

[devcpp]

Exactly. I have never heard of Google sending emails on my behalf through gmail without me knowing about it.