I dunno, Justine. Skimlinks have been lurking in the background of the site for ages before the introduction of these autolinks, along with a few other ad trackers. I questioned this on the 'why is MN so slow?' thread and asked what data they are collecting.
Your privacy policy says:
Passive Information Collection
As you navigate through this site, certain anonymous information can be passively collected (that is, gathered without your actively providing the information) using various technologies, such as cookies*, clicktags, beacons and other navigational data collection (such as server logs). Your internet browser automatically transmits to this site some of this anonymous information, such as the url of the website you just came from and the IP address and the browser version your computer is currently using. Via the IP address we may also determine your rough geographical location, such as town or city.
This helps us analyse data about our site traffic, so we can improve Mumsnet and tailor it more to our members' needs. All information is anonymous and only used for operational purposes.
Clearly Skimlinks and the others are collecting passive data for reasons other than 'operational purposes', we've been to their site - it's their whole business model. Does it not count if it's a third party to whom you've given permission, rather than MN itself?
I do think this is a bad move. There have been problems with stability, speed and security which I wouldn't mind betting are down to the ads and ad-related scripts that are running and this latest development looks like the kind of thing that happens when you get a virus. It makes the site look cheap and nasty and IMO damages your brand. I think it's likely that more and more people will just start blocking ads and ad trackers altogether.
I realise MN needs to make money. Several of us have said we'd pay for an ad-free version. It could be offered as an option, then people who don't want to pay can continue to see ads. Worth a try?
I think at the very least you need to update your privacy policy.