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Apparently Yahoo Mail also has a similar feature. 
https://mail.yahoo.com/d/list/referrer=receipts&accountIds=1&listContentType=REFUND_CARDS&listFilter=ALL_REFUND_CARDS …pic.twitter.com/cXCSeeI1Os
"Google tracks a lot of what you buy, even if you purchased it elsewhere," @robotodd and @megancgraham write for @CNBC https://nyti.ms/2HGQBZY
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On the one hand this feature is easier to find than Gmail's, on the other hand we know Yahoo does use this for selling ads.https://techcrunch.com/2018/08/28/yahoo-still-scans-your-emails-for-ads-even-if-its-rivals-wont/ …
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