To help deal with the initial shortage of native apps developed for the M1 chipset, Apple has allowed users to install iOS apps on M1 Mac computers. Even though iOS apps aren’t necessarily optimized for laptops or computers, it still helps to fill a void, even if it is temporary. However, for those users out there who might have been sideloading unsupported iOS apps, you might be disappointed to learn that will no longer be possible.
Link: M1 Macs Will No Longer Be Able To Sideload Unsupported iOS Apps
via http://www.ubergizmo.com