Amazon Smile trades ad views for 1% of their proceeds to a non-profit of your choice (including the FSF, EFF, and more, though I think RMS would have a seizure accepting this money)
Whole Foods gives you significant discounts on hot foods if you scan a QR code from the app (still expensive though).
I don’t use these personally but I can totally see someone using them.
Right after they killed Book Depository? Wow they are getting rid of everything worth keeping…