Apple Maps En Route To Start Showing Search Related Ads Next Year
The Apple Maps ads will likely be directly related to search results. For example, you might see a local McDonald's show up first as an advertisement if you search for nearby restaurants. This is similar to the way some search engines display certain search results.

Apple Maps features shown on iPhone and Apple Watch
This change may upset some users. Apple Maps was one of the few GPS and mapping apps that did not regularly serve ads. Google Maps on Android does not display ads while a user is driving but it does show promoted items when you first open the app. Waze, the "social driving app" owned by Google, is entirely driven by ads. Nevertheless, it will only show them when the driver is fully stopped.
It has been almost ten years since the release of iOS 6 and Apple Maps. Unfortunately, Apple Maps has not always been well regarded by users. Its launch was so poor that Apple CEO Tim Cook publicly apologized for it. The app has since been regularly improved by Apple. The company has merged and purchased various mapping partners and even deployed a drone fleet to better its offering. However, this has caused Apple to sink money into something that is not yet necessarily earning a significant return.

Apple Maps features shown on iPhone
We understand that you want to recoup costs if your service is a "money-sink", and it is unlikely that Apple will let off the gas on these plans. Apple's next event on September 7th is expected to outline the iPhone 14 and new Apple Watch models. It is possible that they will demo the new advertisement system as well.