We don't know - that's my point when arguing with some of these rabid deranged fanboys on here. None of us on this board (until proven otherwise) KNOW Apple's true motivation for anything or how much money may have been saved.
Since I was curious I looked into it and the only article I could find where someone did a
deep dive into an Apple charging brick was back in 2012. The components added up to $4.56. Clearly Apple is likely to get a better deal on components, but that amount isn't disclosed anywhere. With
inflation that is $5.88 today. Obviously there is R&D, labor to assemble, packaging, marketing, etc. etc. For
iPhone sales, Apple sold 202 million iPhones in 2020, and 211 iPhones in 2021. I can't find a breakdown by model so let's just assume 75% were an iPhone 12 or later, so that's 152 million in 2020 and 158 million in 2021.
In components alone, that is a 1.82 BILLION dollar savings for Apple. Taking into consideration they probably pay less for components, we can even call it $3.50 cost to Apple which still results in a 1.09 BILLION dollar savings for Apple.
TL;DR - Apple is saving at least a billion dollars on not supplying an iPhone charging block in 2020 and 2021 alone. Please do not be so naive as to not think this was/is the primary motivation for Apple in this decision.