# App Tracking Transparency begins enforcing opt-in tracking

Date: 2021

## The fact

In April 2021 Apple began enforcing App Tracking Transparency, requiring opt-in for IDFA tracking, a completed privacy-and-ads instrument under Cook.

## Context

Neighbouring privacy labels December 2020 are the disclosure twin. Neighbouring DMA is later EU law that asked whether ATT favoured Apple ads. He did not write a GDPR article.

Privacy labels 2020 are neighbouring disclosure. DMA 2023 later scrutinised ATT’s self-preference risk.

[Tim Cook](/people/tim-cook) has been Apple CEO since 24 August 2011. He does not write a DOJ complaint, a Commission DMA decision, an Irish Finance Act, or a Chinese Cyberspace Administration rule. Steve Jobs is a different, dead person. A product launch is not a labour statute. A privacy keynote is not a completed DMA compliance certificate. Keep those dates separate. A 10-K climate page is not a unique ppm. An assembler audit is not a unique suicide count as his personal tally. A DMA listing is not a completed sideload world. A DOJ complaint is not a breakup. TSMC fabricates; Foxconn assembles; App Review enforces.

## Evidence and sources

Apple carries the official instrument or communique. Reuters records the same dated act independently.

## Significance

The path is [personal-data-protection](/drivers/personal-data-protection) mixed with platform power: a completed opt-in is a tracking-constraint instrument that also shifted ad rents.

## What is established and what is not

Established: April 2021 ATT enforcement, independently reported.

Not established: that tracking ended, or a unique later publisher-Gini coefficient from the prompt.

What would change the picture: a contradictory original with a different date or name, a later repeal, a court that vacated the instrument, or a measured series that can be argued, with lag and alternatives, as a consequence of this instrument rather than of later institutions.

The date is the date of this instrument, not a licence to back-date every later harm or benefit.

iOS prompted. Developers lost some IDFA. Apple’s own ads sat in a neighbouring stack later criticised.. A later repeal, court stay, or successor order would be a different Fact with a different date. That pair identifies App Tracking Transparency begins enforcing opt-in tracking, not a later speech about App Tracking Transparency begins enforcing opt-in tracking.

Co-authors and later implementers named in Context remain on the file. App Tracking Transparency begins enforcing opt-in tracking on 2021-04-26 is not a licence to treat every later Apple communique as this same act. If a later repeal, stay, or successor instrument exists, it needs its own date and its own row. This dossier refuses to average App Tracking Transparency begins enforcing opt-in tracking into a personality. The contribution described on this Person row is limited to He enforced as CEO. iOS prompted. Developers lost some IDFA. Apple’s own ads sat in a neighbouring stack later criticised. That limit is the alternative to treating office-holding as authorship of every later series.

## People

- Tim Cook: https://factrail.ai/people/tim-cook

## Drivers

- Personal-Data Protection: https://factrail.ai/drivers/personal-data-protection
- Antitrust Pressure in Digital Markets: https://factrail.ai/drivers/antitrust-pressure-in-digital-markets

## Sources

- https://www.reuters.com/technology/apple-app-tracking-transparency-2021-04-26/
- https://www.apple.com/newsroom/

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/aapl-be-transparent-2021