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Why on earth would you imply that cross-domain user tracking is a good thing?

because it's a choice

Edit: I misread "is" as "could be". It's a good thing to have because it could be a good thing to use. It may be a bad thing to have enabled by default, but it's a bad thing to omit outright.

The potential for abuse is staggering. Yes, it would be good to have to benign purposes, but unless you trust everyone on the internet to act honorably, it's a terrible idea.

Then disable it by default, but don't leave it out altogether.

Can you give me an example of when it would ever be appropriate to turn something like that on?

whenever the user wants it

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