On Magento 2 One Step Checkout's Privacy Page you can request and collect all the privacy and GDPR related information that Magento 2 One Step Checkout is providing.
The privacy policy by is a legal document or statement that discloses how Magento 2 One Step Checkout gathers, uses, discloses, and manges their customers' data.
The basis for Mageplaza sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.