And even then most of the great games from the early years of the app store are long gone either their developers never updated them to 64bit or stopped paying their yearly App Store licence and unlike Flash games where the executables and runtime could be saved [1] they're all gone for good now because of the locked down platform.

[1] https://bluemaxima.org/flashpoint/

Google Play has many sites that scrape and back it up. Even on iOS, apps can be backed up as ipa's and installed without jailbreak with something like alt store.

I doubt those last long enough to act as a meaningful archival solution. Piracy sites maybe, but the links rot really damn fast.