Ez már 2010 óta működik:
"Currently known as "Microsoft Rewards",[68] launched by Microsoft in September 2010, it provides credits to users through regular Bing searches and special promotions"
https://www.cnet.com/how-to/use-microsoft-rewards-to-score-free-amazon-…
Microsoft's maximum rewards come from running Web searches with Bing (5 points per search, up to 250 points per day) on your PC. If you're mostly on your phone or tablet, use Bing in your mobile browser (again, 5 points per search) and you can score up to 100 points per day.
Let's do the math. Assuming you get to Level 2 status (very easy to do), then do nothing more than switch to Bing, you can potentially earn 350 points per day -- or 10,500 points in a 30-day month.
To score a $5 gift card from any of the four aforementioned stores, it'll cost you 5,250 points. So you can bank a pair of cards just by maximizing your search points. And there are other rewards as well, like a three-month Xbox Gold subscription for 15,000 points, or even 12 months for 29,000 -- that's the equivalent of just three months' worth of maxed-out search points.