I would say they have other implies to detect if the information you give through JSON-LD is relevant to their search engine (like checking your web page is really talking about what it claims to discuss). The problem is usually a result of both spammy material or spammy markup utilization. https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html