Because it doesn't meet the criteria. To summarise heavily, they are:
- Size criteria:
Have an annual turnover in the European Economic Area (EEA) of at least €7.5 billion in each of the last three financial years, or
Have a market capitalization of at least €75 billion, and
Provide the same core platform service in at least three EU countries.
- Control an important gateway:
Provide a core platform service which is an important gateway for business users to reach end users.
- Entrenched and durable position:
Enjoy an entrenched and durable position on the market, operationalized by having had at least 45 million monthly active end users and 10,000 yearly business users of the same core platform service in the EEA in the last three years.
In fact, the EU has admitted that iPads do not meet the criteria, and are making an explicit exception to include them.
Don't get me wrong, I'm _very_ happy about this, but you asked ;)