I would say they produce other indicates to recognize if the information you give via JSON-LD is suitable for their online search engine (like checking your page is really referring to what it claims to mention). Concurrent with the cessation of how-to and FAQ-rich results, Google released structured data support https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html