In addition to what others here have said, Apple historically has been a hardware and software shop. It takes a lot more time for them to piece things together

In addition to what others here have said, Apple historically has been a hardware and software shop. It takes a lot more time for them to piece things together than it would for a web or mobile startup, something Apple have very low presence in themselves. Aside from the OSes and mostly desktop software (which are giant tasks by nature), very few of what Apple does can be directly compared to how most tech startups operate these days.