Maybe competition? x86 has only 2 competitors left. ARM has more diverse ecosystem of competitors and the environments ha been different.
ARM design had to be adjusted/developed for a cell phones often cost 10% of a normal computers (main use of x86). I can buy a cell phone a display, battery, memory and ARM cpu for $100 total (no idea how much ARM chip alone cost). The phone will have a semi-acceptable performance.
Even cheapest x86 CPU with emi acceptable performance probably cost more than $100 and cheapest x86 cpu more than $50.
Ampere is the only game in town for buying a server ARM chip. It isn't like anyone is rack mounting Samsung Galaxies, so the variety of manufactures working in other spaces doesn't really matter.
Nvidia claims to be working on getting in the server game later this year so maybe ARM will get to x86 levels of competition.
ARM design had to be adjusted/developed for a cell phones often cost 10% of a normal computers (main use of x86). I can buy a cell phone a display, battery, memory and ARM cpu for $100 total (no idea how much ARM chip alone cost). The phone will have a semi-acceptable performance.
Even cheapest x86 CPU with emi acceptable performance probably cost more than $100 and cheapest x86 cpu more than $50.