I don't want to be included in something that I never asked to be part of, and then have to put in the effort to get out.
This is one of the things that is so upsetting: most of the industry puts it on the consumer to get out rather than come in. I often look at the list of third-parties when a website says I can opt out. There are often over 300 third parties that I would have to opt out of one at a time.
That's just plain abusive.
Apple blocked access to the hardware address of the device and moved to a random identifier that could be turned completely off back at iOS 10.
Android eventually followed suit.