It shouldn’t be opt in or out tbh. This shit should just be illegal.
The whole adverspying industry needs to be reined the fuck in and slowly turned to mulch.
The first step to that is letting us see what the advertiser has in our hidden “profiles” and let us modify and/or wipe them out.
I remember my bank used to ask me for the 2nd, 5th and 7th letters of my password from time to time.
There’s only one realistic way they can know those to ask me.
They haven’t asked me that for a while now, so I can only hope they encrypted them properly at some point.