On Cloudflare DDoS Protection's Privacy Page you can request and collect all the privacy and GDPR related information that Cloudflare DDoS Protection is providing.
The privacy policy by is a legal document or statement that discloses how Cloudflare DDoS Protection gathers, uses, discloses, and manges their customers' data.
The basis for Cloudflare, Inc. 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.
Subprocessors are companies that provide a service for Cloudflare, Inc. and who has or potentially will get access to personal data of their customers.