Earlier quoted context omitted.
Piezo, Rogue Amoeba's app, was removed from the Mac App Store with "minimal publicity", according to their blog post: https://weblog.rogueamoeba.com/2017/02/10/piezos-life-outsid...
They're also a very savvy company that has their own store. They didn't have to do any work other than turn off the App Store listing. Smaller developers may have to go through considerable pain and anguish in setting up their own store, or they can suffer through even more angusih and pain when the store they entrusted to do their sales goes down in flames, as with Kagi. https://tidbits.com/article/16665 Being self-…
It's slightly more work to sell outside the App Store, yes, but it's really just not that difficult. If a developer plans to make a living, or even just side income, from app sales, it's work that's worth doing.