The document discusses factors for financial services companies to consider when deciding whether to buy or build a customer data platform (CDP). It notes that companies spending less than 9% of revenue on marketing should consider buying a CDP, while those spending over 15% should consider building one in-house. Buying a CDP offers lower costs through subscriptions but vendor dependency, while building one allows for full customization but at higher costs and slower release times. The document advises selecting an industry-specific vendor for bought CDPs and carefully planning a build.