Jesus, that is a gross way to inject advertising into turn-by-turn navigation.
Edit/update from 9to5google so this post does not spread what is apparently inaccurate information: https://9to5google.com/2024/07/08/google-maps-pop-up-quick-detour-ad/
This is a most excellent place for technology news and articles.
For some reason, this got me imagining an ad causing an unnecessary detour the wrong way on a one way road and cause a head-on collision. which is going to get them hit with a class action lawsuit that could send their line graph all the way down into the ground.