This is nonsense. Apple executives have repeatedly claimed that the 30% fee was a good deal compared to retail boxed software which they say was the norm in 2005 or so, but really there were large numbers of small independent software vendors making good money through specialised e-commerce vendors like DigitalRiver or the original Kagi with fees in the 8-15% range iirc, or just selling direct with payment processors like PayPal for ~5%. Bandwidth was not a big cost back then and still isn’t today unless you’re doing something like 4K video streaming.