One of the advantages that Apple has promoted after the arrival of the first Macs with the M1 chip is the possibility of run applications intended for iPhone and / or iPad, thanks to the fact that the runtime environment is essentially the same. But it is one thing to open this possibility and another thing is to allow installation of all apps from the iOS and iPadOS App Store on a Mac.
Apple does not want it: what they are looking for in Cupertino is that the developers offer this possibility but having well prepared their applications so that the execution is perfect. However, practices like Side loading allowed users to bypass limitations and install any app for iOS and / or iPadOS on their Mac. But it’s over.
If you want Instagram on macOS, Instagram (and not you) will need to allow it
Apps like iMazing are the ones that allowed us to extract the .IPA executable from an iPhone or iPad app to a Mac and be able to run it smoothly on macOS, but now Apple has activated a limitation on its servers that will prevent this from continuing to be possible
So you can no longer install apps like Netflix or Instagram on your new Mac with an M1 chip. To be able to do that the app developer will need to prepare it and receive approval from Apple so that it can be distributed in the Mac App Store
“This app cannot be installed because the developer did not create it with the intention of running it on this platform.”
At this point, the only hope we have now is to wait for all the developers (or the craziest) to start converting their apps to be universally executable on iOS, iPadOS, and macOS.