ARM produces both architecture specifications and the designs for chips that implement those specifications. Some companies license the architecture specificat

ARM produces both architecture specifications and the designs for chips that implement those specifications. Some companies license the architecture specification and design their own implementations, Apple being the leading example. They then pay TSMC to fabricate the chips for them. Other companies license the implementations and pay to have them fabricated. The latter category varies in the level of customization they apply to the implementations they license, it's generally much less customized than the what those in the first category achieve.