Cannot procure the « data-sitekey » of a recaptcha on a obvious site

Just like the title says I'm buying for a ingredient that has a code known as « data-sitekey », many websites thunder that this exists on any enviornment with a recaptcha nevertheless I will't procure it wherever on the positioning below.

Design in quiz : https://mailchi.mp/field/xbox-sequence-x-restock

Can't find the