How is it an alternate explanation? If you hire only one janitor it takes longer to clean the premises. Its not really an explanation when you're sitting on piles of cash.
Assuming hiring and training janitors is instant, and buying them up on a massive scale does nothing to the cost of each janitor, and there is no pressure to accept apps quickly, sure, but that's not the scale world Apple lives in.
I think that's a false equivalence. The devil is in the details with large projects like this.
There will be absolutely no change to the cost of each janitor because the scale is not massive at all. Apple is most certainly not hiring thousands of full time employees for app reviews. In 2009 they had 40 employees spending 6 minutes (at most) on each app.
I think that's a false equivalence. The devil is in the details with large projects like this.