The link you posted examines the issue in detail, IP address on its own is already on its own a decent identifier at the household level, and used today, and th

The link you posted examines the issue in detail, IP address on its own is already on its own a decent identifier at the household level, and used today, and that's why there is a specification on Willful IP Blindness proposed by Google. But IP alone is imperfect as well anyway for tracking.