One example might be the provision of a ‘free attraction’ service in exchange for surveillance capabilities, and the business model being various unrelated ways

One example might be the provision of a ‘free attraction’ service in exchange for surveillance capabilities, and the business model being various unrelated ways to exploit those capabilities (targeted ads, selling the raw data, selling products derived from the data, etc). This has become the default business model of the B2C Internet, as distinct from offering a service in exchange for payment.