Easy to imagine a world where not everyone has those apps installed - my home is a great example. Also, it’s easy to imagine a huge building full of people who all connect to the internet using one (or maybe a small handful) of nat’d IPs. Maybe we could call that an ‘office’...

I look at it this way - if this cross-app tracking BS wasn’t so important to FB, they wouldn’t have their panties so wadded up about it.