Infinity War and Endgame are based in part on The Infinity Gauntlet comic miniseries by Jim Starlin, and he spoke about the snap, which is original to his story, in an interview with Mashable.

Did Thanos really win? Since the movie came out, those have been the big questions. But I have a more technical and shamelessly nerdy one: can you actually snap in a big metal gauntlet?

Avengers: Infinity War follows Thanos on his quest to fill his Infinity Gauntlet with the six Infinity Stones. Harnessing the power to control all of creation requires a pretty strong artifact and ...

Avengers: Endgame picked up in the aftermath of Avengers: Infinity War. The 2018 movie saw Thanos wield the Infinity Gauntlet to snap half of life out of existence. With Endgame, the Avengers ...

By studying the friction generated in a finger snap, a team of scientists concluded that it would've been physically impossible to snap while wearing the Infinity Gauntlet.

Seeing Thanos snap his fingers while wearing the Infinity Gauntlet in Avengers: Infinity War inspired the researchers to apply their framework to the massively popular cinematic franchise.

Avengers: Endgame picked up in the aftermath of Avengers: Infinity War. The 2018 movie saw Thanos wield the Infinity Gauntlet to snap half of life out of existence.