Maxon works closely with Apple on all new technology. Be it new hardware, changes like the 64 Bit move or Metal, new OS versions, you name it. You can see that right back to G4/G5 times. I wasn't around earlier so i have no idea what went on before. Maxon and Cinema 4D have been part of so many Apple presentations over time, i have lost track. Since we are often one of, if not the first, app to support some new tech there is no need to pull any marketing stunts, it's mostly our devs that are featured anyway, Like Philip now, or Cathleen before him.
Apple supporting the transition of Blender from Intel to M1 makes a lot of sense for Apple, they do not want to be left out there just because ressources aren't available and the actual monetary and engineering effort for Apple is minimal. I would not start guessing if this is the start for some larger cooperation or just a stepping stone for things to get moving, at this time it is simply a leg up and i am quite happy to see Apple supporting Open Source Software. The self interest of Apple might be related to Blender often being used in academia for early test implementations of CGI algos, losing that due to the hardware change would be a a bit of a blow to the use of Apple systems in research. All in all a good investment either way.