Since the launch of M1 chip-based MacBooks, Apple has been allowing sideloading of apps made for iOS, as the in-house chip can support the apps made for iPhone and iPads in the MacBooks. This could be due to the fact that the native app support for Apple Silicon was not widely available. Most of the popular apps were only in the beta version, and others are catching up.
To counter this, Apple had intentionally allowed users to sideload iOS apps from third-party solutions like iMazing. Now, Apple is restricting the users from giving this freedom. "This application cannot be installed because the developer did not intend for it to run on this platform." Apps that have already been sideloaded are working fine. Only new installations are being restricted. So make sure you don't uninstall any of the apps as it will be harder to install the same gain. The only option that remains is a jailbreak, which is risky and not recommended. The change applies to M1 Macs running the stable macOS Big Sur 11.1 and the public beta of macOS Big Sur 11.2.
The iOS apps, which were just working fine until now, had been a savior for new Apple MacBook users. There are no M1 Mac apps for big players like Netflix, Instagram, and Facebook, which could have been easily sideloaded to the MacBooks. We already know that Apple likes to keep its ecosystem tight and secure, but on the other side, the users don't get much freedom.