Until now, you could install any iOS application on a Apple silicon without going through the App Store. As if it were any Android smartphone, you could download the .ipa file from any iOS app on the internet and install it on your new Mac with an M1 processor.
Apple has noticed, and has not liked it at all. He has cut his losses, and it can no longer be done. Now Apple Silicon only support modified iOS apps to be able to run on the M1. If the developer has not adapted it for this purpose, they will not work.
Apple has implemented this week a locking mechanism to prevent owners of new Apple Silicon Macs from running iOS applications that have not been modified by their developer to run on the new M1 processor.
Until now, you could download the .ipa file of, for example, the iMazing application from the internet, and install it without problems on your Apple Silicon. As of the last update of Big Sur macOSThis is no longer possible, until the iMazing developer releases a new version of its iOS app compatible with Apple Silicon.
From now on, when trying to install an application using the method explained above, a error message which says "This application cannot be installed because the developer did not intend for it to run on this platform." Clearer the water.
The only iPhone and iPad apps that can now be installed on M1-based Macs are those that developers have modified expressly for this, and even though they are iOS applications, they are compatible with the new Macs.
Apple has disabled this feature on Apple Silicon Macs that have been updated to the latest version of macOS BigSur 11.1 y macOS Big Sur 11.2 beta.