The extent of your usage of an iPhone is rarely mandated, and most people I know use the iPhone primarily for photos, iMessage, a browser (usually Chrome? At least in my circle) and an email account.
For those functions, Apple is hardly slamming you with recommended content and ads. Instead, you pay an initial premium for a solid bit of hardware. And if you want more, say if you want to store a lot of photos on their servers ($), you pay for it with more money.