[georgyo]

Shipping logs would be an extreme breach in my mind.

But I can BS. Without a cross site unique identifier, the logs would not be usable across different sites...

Though... I guess a browser fingerprint could be used as a non-centralized method to generate that unique key...

[krono]

Anonymous metrics, just the basics to help us keep track of service availability. Oh and a unique device identifier along with some information about your hardware and OS. Well... and your IP and connection times of course.

Don't worry though, the marketing websites of the commercial services we use to gather and analyse this data say they're keeping your data very safe and secure!

Your privacy means a lot to us.

[robin_reala]

No no, it’s “we value your privacy” which can be read in a couple of different ways.

[reaperducer]

Login name, email address, credit card number. Lots of ways for companies to get together like this to follow you around the web and apps. All invisibly. And you'd never know it.

[willvarfar]

Matching up is called “entity resolution” and reminds me of this recent showHN https://news.ycombinator.com/item?id=28127650

[haliskerbas]

Ad tech does not need a cross site unique identifier for everyone in order for cross device targeting to work well enough.

There’s other tricks of the trade that make it good enough.