I am the lead on this feature and I was out of town all last week as I stated. I’m back now
The streaming scrobbler is a convenience feature to automatically track what you’re watching. The very first Trakt feature way back in 2010 was a scrobbler for XBMC. Automation is a core feature for Trakt and this is the latest iteration of that. We don’t sell your data.
I will look into adding a button on the website to unlink the service. If you click on the service in the mobile app, can’t you unlink it there?
I noticed this too. Netflix saves when you start watching something, so I will add the runtime to make it more accurate.