While researching this post, I realized that Taco Bell has quietly become one of the leading in-store freebie provider. Going back to 2016, they've offered four or five free food events each year on top of their biannual free Doritos Locos offer that stretches back to 2008.
Case in point, this free Mexican Pizza starting on May 19! Taco Bell is bringing back the “fan-favorite Mexican Pizza” and giving them away on Thursday, May 19, 2022 through 11:59PM PST on Wednesday, June 1. You'll want to download their app and then redeem this offer for an in-store or drive-thru pickup order.
Additionally, members of their free loyalty program will get first dibs with early access to the menu item beginning May 17.