On Google VPC Service Controls' Privacy Page you can request and collect all the privacy and GDPR related information that Google VPC Service Controls is providing.
The privacy policy by is a legal document or statement that discloses how Google VPC Service Controls gathers, uses, discloses, and manges their customers' data.
The basis for Google 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.