Google Advertising ID removed from analytics in 0.16.2
What is Google Advertising ID
This link explains it quite well, but basically it is an identifier stored on your device that identifies you to Google when using different apps and when browsing websites. This allows Google to determine a lot of information about users.
This information is not directly available to people who operate apps or websites (like me), but is available indirectly in an aggregate form. For example, I can see a report that says what percentage of my users are male or female, what their age ranges are, and even their interests broken down into various categories.
While this is all quite interesting, I realised I’m not making any decisions based on it, so I decided to disable it.
What does this have to do with advertising
One of the main uses of the data is to provide more relevant advertising. That will still be enabled for Tic-tac-toe Collection for users who have personalized ads enabled. It functions based on information already collected about you (from other places that have Google Advertising ID enabled for their analytics).
With regards to Google, Tic-tac-toe Collection will no longer be a source of information about you, but will still use it if it is available.