Designing an ARM Chip from ARM blueprint and TSMC is relatively simple and cheap for Amazon. And there is enough market and hype to justify the investment as they will probably break even within 24 months. It has become obvious that Intel isn't really willing to lower price that affect margin and sales. So Amazon needs to make a statement to Intel to say they have lots of options, EPYC and ARM.

I don't want to hype Zen 2 / EPYC 2, but I do think it will be very competitive. And that is a Threat to Intel. And fundamentally, the REAL threat is neither ARM, AMD or even RSIC-V, it is TSMC.