At Rogue Ameoeba's blog Under the Microscope, Paul Kafasis writes:

During this time, Apple placed an emphasis on improving the security of MacOS, continually locking the operating system down further and further. Though their changes weren't aimed at the legitimate audio capture we provided our users, they nonetheless made that capture increasingly difficult. We labored to keep our tools functioning with each new version of MacOS. Through it all, we lived with a constant fear that Apple would irreparably break our apps.

In 2020, the disaster foreshadowed literally one sentence ago struck. Beta versions of MacOS 11 broke ACE, our then-current audio capture technology, and the damage looked permanent. When we spoke briefly to Apple during WWDC 2020, our appeals for assistance were flatly rejected. We spent weeks attempting to get ACE working again, but eventually we had to admit defeat. ACE as we knew it was dead in the water, and all options for replacing it involved substantial reductions in functionality. Though we did not discuss it publicly at the time, things looked grim for the future of our products.

It took three years of working with Apple, but Rogue Amoeba was eventually able to replace ACE with the next-generation audio capture technology ARK, all in the service of improving the first-run experience. It's a fascinating story that reveals a bit of what developers go through in keeping up with Apple and its emphasis on platform security.