Safari tracking block: what reported publisher losses mean for PPC measurement

Safari tracking restrictions are not a good enough explanation for every account that suddenly looks worse. If a media partner blames Apple for a rise in reported CPA, I want them to explain what stopped working and how that connects to the result. Losing the ability to recognise a visitor, losing a recorded conversion and losing a sale are different problems. They need different responses.

Digiday's publisher revenue figures are worth watching, particularly for businesses heavily dependent on programmatic advertising. But Aditude's estimated losses are not a forecast for every publisher, and a fall in publisher eCPM does not tell me whether an advertiser is getting less business. Are we losing sales, or seeing less of the business we already get? Apple documents blocking connections associated with advanced fingerprinting, not making entire advertising companies unable to operate in Safari. It also documented protection against known fingerprinting scripts in September 2025. A supplier needs to identify the affected function rather than point vaguely at a software update.

I'd compare any change in Safari conversion reporting with traffic and results in analytics tools or advanced CRM reporting, keeping conversion lag and changes in spend in view. Those sources can have gaps too, so agreement between them is useful evidence rather than proof. If recorded conversions fall while enquiries and sales remain steady, cutting spend immediately could mean pulling back from useful traffic. If sales are falling as well, calling it a measurement problem will not pay the bills.

I support making it harder to recognise people through fingerprinting. Advertisers still need an honest account of what their suppliers can measure and deliver, and browser users having privacy overrides is not an advertiser workaround. For now, this report gives me a reason to challenge a vague performance explanation, not to pull budget from Safari traffic. Any budget change needs to follow what is happening to the business, not just the explanation attached to a worse CPA.