Oh, the woes of cookies not working on mobile phone browsers. Why? Disabled so as to avoid tracking. “Tracking,” what does Wikipedia say about tracking?
20180720/https://en.wikipedia.org/wiki/Tracking
20180720/https://en.wikipedia.org/wiki/Website_visitor_tracking
20180720/https://en.wikipedia.org/wiki/Ad_tracking#Internet_tracking
And finally ad wear-out, it has too happen after too aggressive a tactical marketing campaign. Or after even overly humorous marketing campaigns.
20180720/DuckDuckGo ad wear out
20180720/https://www.ipsos.com/en-us/advertising-wear-out