The App Store is riddled with ads; the Music App is a giant ad for their music streaming service; there are ads in the Settings app!¹ Maps will reportedly get them too.²
I too have mostly escaped ads on iOS, but I think that’s a combination of not living in the US, never opening the App Store, and a few other factors. I’m under no illusion that will last forever. Tim Cook must be salivating with ideas.
¹ https://daringfireball.net/2023/04/ios_adware
² https://www.macrumors.com/2022/08/21/ads-coming-to-apple-map...