[tetsusaiga]

You're right, this is actually a lot harder to recently, with the iOS updates that occurred a year or so ago. It's a space that evolves very quickly.

But this is a good place to point out that, yes - there is nuance to all of this - and I didn't really mean to turn it into a thesis on online advertising (lol) so much as to say:

It's still easy to be more accurate than "Turn it off and see what happens".

Even a semi-sophisticated media buyer is going in with a plan, and some method of measurement.