The reasoning is very clear-cut. Because you are legally required to achieve this. With the introduction with the GDPR in May 2018, organizations are actually obliged to get the consent of their (European) end users before using their user data for just about any marketing campaigns. Social Login for PrestaShops https://www.presta-addons-modules.com/es/seo/prestashop-seo-automatic-google-rich-snippets-json-ld-opengraph-twitter-tags-schemaorg.html