There are four major manufacturers of flagship chipsets - Qualcomm (Snapdragon), Samsung (Exynos), Huawei (Kirin) and Apple (A-series). Three of those tend to be used in the respective companies' own flagships. Apple certainly doesn't want to share while Samsung and Huawei rarely find outside customers. We often talk about the power usage of a chipset - it's important for the battery budget. Fabbing the chip at lower nanometers helps with that, but also balances the other important sheet. The price of a chip (patent costs aside) is proportional to its size. This makes it tricky to find...
Source: https://www.gsmarena.com/comparing_the_sizes_of_flagship_chipsets_qualcomm_samsung_huawei_adn_apple-news-30240.php
