Do you suggest that Google apps on iOS are somehow exempt from new privacy protections?
Probably what OP is suggesting is that in return for that $5B, Apple will call up Google and say "hey we're adding these new privacy protections, will that be a problem?" and Google will have time in advance to get around them
Apple isn’t going do any favors for Google for a measly $10B.
It’s much more meaningful for Google and Google knows it. For them, it’s a bargain, as it gives its advertisers access to customers who actually spend money.
Note that google appears to be acting as though they are effected, you can see this in their push for FLOC/topics (but the impetus for this could be coming from android moreso than search)