I am pretty sure this is referring to the Mac App Store, and would also apply to Steam for Mac or really trying to run any mac software from more than a couple of years ago. Apple's aggressive deprecation of Carbon and 32-bit have personally caused me maddening frustration a very large number of times. As much of a technical achievement as Rosetta 2 is, I also expect them to drive a nail through its heart at the first opportunity. I think Apple should have allowed their compatibility layers and deprecated libraries to flow into open source or community maintained projects instead of simply being abandoned.