The document discusses how businesses can build customer identities progressively throughout the customer journey to improve experiences and foster loyalty. It argues that businesses should obtain small amounts of anonymous customer data early to personalize experiences, then encourage registration by offering value in exchange for lightweight data like emails. A customer identity and access management (CIAM) system can integrate this data across systems and manage customer consent to privacy policies. By progressively building rich customer profiles while respecting privacy, businesses can deliver highly personalized experiences that increase trust and advocacy.