You say that, but AWS has still launched EC2 instances with both AMD and ARM CPU cores recently. I imagine Amazon buy enough Intel CPUs for them to take notice.
I wonder if the primary driver for buying and offering alternative platforms for EC2 instances was to send Intel a message. "We aren't afraid to go to AMD if you don't make your offering more competitive."
https://www.servethehome.com/intel-is-serving-major-xeon-dis...