The market for in-app advertisements worldwide is now projected to be worth approximately US$226 billion in 6 years, according to the latest research. Of these, ads on Android are thought to be capable of the highest growth. In addition, the Asia-Pacific (APAC) sector is thought to exhibit the most growth between 2019 and 2025.
https://www.notebookcheck.net/The-in-app-market-may-be-worth-well-over-US-200-billion-by-2025.428736.0.html