"When we say we process your data as a 'platform,' we mean that when you choose to share data with us, or bring over information from third parties (like a bank or loan provider), Intuit uses that data together to power experiences across the Intuit Platform and products, not just within the individual offering(s) you're using. This means that, for example, we may use your bookkeeping details from QuickBooks, contact and purchase history details from Mailchimp, certain information from TurboTax, and/or recommendations from Credit Karma."
Intuit explicitly combines user data across its entire product ecosystem (TurboTax, QuickBooks, Mailchimp, Credit Karma), creating a unified profile from tax returns, financial records, email marketing data, and credit information.