In the UK phone operators have complained about it on the basis that:
> [it allows Apple] to leverage its considerable market power into many areas of the market and thus being able to further entrench its position ... Network providers would no longer be able to use web traffic data over Safari to develop their own digital products and services that complete directly with Apple. For example, a network provider may no longer have access to information about a user's content viewing habits to develop their own content that competes with Apple TV. Similarly, a network provider may no longer be able to share consumer insight with third parties that provide digital advertizing services in competition with Apple Search Ads...
How true that is, who knows, but it's an interesting angle on how it benefits Apple