I think it would be completely crazy if apple did this without entering into a special contract with google. Theres no way some sales engineer just signed up for a google ads account one day
a) Apple will be a big customer for Google but nothing compared to companies like P&G who manage hundreds of products or those who have more competitive search terms. And in this particular case it's neither.
b) Apple has a dedicated App Store Marketing team who likely signed up or maybe they used their main account. Either way it's pretty simple and you don't need to ask Google's permission.
a) Apple will be a big customer for Google but nothing compared to companies like P&G who manage hundreds of products or those who have more competitive search terms. And in this particular case it's neither.
b) Apple has a dedicated App Store Marketing team who likely signed up or maybe they used their main account. Either way it's pretty simple and you don't need to ask Google's permission.