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