Mobile app and game downloads combined declined slightly year-on-year in the third quarter of 2021 (3Q2021), as the pandemic-era boom in this area recedes. Nevertheless, the amount of money coming in on both the Google Play Store and the Apple App Store is still going up. The latest research indicates that TikTok is still #1 in terms of revenue.
https://www.notebookcheck.net/Spending-on-mobile-gaming-grows-by-nearly-8-for-the-third-quarter-of-2021.568733.0.html