Just to balance the other comments here: one of the interviews was a mock sales call where you had to pretend to be selling a SaaS product to the interviewer. Not fun for an introverted developer, and not specified up front. Also if you do the paid take-home project, they mean reasonable rates for full-time, not reasonable rates for freelance.

There are at least 16 different switches to turn off recommendations and marketing emails from LinkedIn, because each category has a mixture of interaction-based notifications and recommender-style ones. You can reduce it to about 8 if you don't mind disabling each category entirely.