According to The New York Times, it is estimated that 75% of the $11.8 billion Google made from mobile search ads came from iOS users. That's a huge chunk of Google's revenue coming directly from phones with an Apple logo at the back.
Since iOS and Android are two direct competitors that never got along too well, Apple won't just let Google make that much money from its own devices. You may recall Steve Jobs saying:
"I will spend my last dying breath if I need to, and I will spend every penny of Apple's $40 billion in the bank, to right this wrong. I'm going to destroy Android, because it's a stolen product. I'm willing to go thermonuclear war on this."Let's take a look at how Apple is trying to eliminate Google search from iOS.