When I clicked on the link it said free fries.
Check your McDonald’s App for a FREE Big Mac Every Day at McDonald’s until September 4th McDonald’s! This offer may not be available for every account (maybe a regional offer). Valid 1x/Day. Expires 9/4/22. Not Valid With Any Other Offer, Discount Or Coupon. Limit 1 Offer Per Person Per. No minimum purchase is necessary to claim this offer.
Kathy
https://www.mcdonalds.com/us/en-us/download-app.html