Apple said in 2016 that it would remove abandoned apps from the App Store. It warned developers that they would have 30 days to update their app before it was taken down. It is not clear whether Apple has continuously been enforcing this rule over the years or if it recently started conducting a wider sweep. Whether it is based on the time that has elapsed since an app was last updated, or if it concerns compatibility with the most recent version of iOS, Apple doesn't clearly outline what it considers to be outdated.
Critics of the policy argue that mobile apps should be available regardless of their age, like old video games are. The policy is tough on developers and Apple doesn't fully respect the work that goes into independent games.
Earlier this month, the Play Store announced that it would begin limiting the visibility of apps that don't target an API level within two years of the latest majorANDROID release version.