They are illegally collecting a number of data from your computer with background processes and there was a data leak from them a few days ago where they demonstrate with their hack what LinkedIn actually collects from its users.

Just watch this video [1] which explains the whole situation in great detail and you will understand.

[1] https://www.youtube.com/watch?v=Mn_CHzm7vwA

Because it is hungry for your data and specifically engineered to collect as much data as possible.

All the charade of preaching efficient algorithms, engineering, optimization etc at LinkedIn and yet just look at them unable to fix basic memory leaks across tabs and idle usage taking 100% CPU just to load the timeline. Leads me to believe they don't even use profilers or any performance engineering best practices.

If anyone re-interviewed these engineers, they would fail their own interview questions.