Intel is microarchitecture + fab corporation. They do it all.
1. TSMC (also GlobalFoundries) is fab only. They design the node for the process and way to fabricate it.
2. Then ARM joins with TSMC to develop the high performance microarchitecture for their processor design for TSMC's process.
3. Then ARM licenses the microarchitecture designed for the new processes to Amazon, Apple, Qualcomm who develop their own variants. Most of the the prosessor microarchitecture is the same for the same manufacturing process.
As a result, costs are shared for large degree. Intel may still some scale advantages from integrated approach but not as much as you might think.
1. TSMC (also GlobalFoundries) is fab only. They design the node for the process and way to fabricate it.
2. Then ARM joins with TSMC to develop the high performance microarchitecture for their processor design for TSMC's process.
3. Then ARM licenses the microarchitecture designed for the new processes to Amazon, Apple, Qualcomm who develop their own variants. Most of the the prosessor microarchitecture is the same for the same manufacturing process.
As a result, costs are shared for large degree. Intel may still some scale advantages from integrated approach but not as much as you might think.