Woah! Are they adding the M1 chip to/in their datacenter servers/blades?

If the current offering is Mac Minis, chances are Amazon has built an industrial grade version of what https://www.macstadium.com/ offers, and have racks with tons of Mac Minis, probably with custom ducting for A/C and so forth.

The current offering being announced is Mac Minis (presumably rackmounted by being on shelves, or something), and the new Mac Mini is M1-based.

The macOS EULA says you can only run it on Apple hardware, so your options are basically Mac Minis or the new rackmountable Mac Pro.

They must or someone else will.

Nobody will without Apple allowing it and taking part, and Apple has not been supportive of things like this. E.g. any macOS hoster and many companies doing macOS software would love to throw money at Apple for permission to run "hackintoshes", but no dice, and the structure of this offering suggests AWS didn't get special treatment either.

I don't think I'm understanding. You are saying nobody will do it without Apple's support, but then say that AWS is doing it. There have been Mac Mini hosting for years, so I'm missing what is different about this.

Nobody will put M1 chips on their own motherboards/blades without Apple support. This is just offering Mac Mini hosting integrated in AWS' platform, with some custom hardware (that AWS also uses elsewhere) attached to the Mac Minis for storage virtualization etc.

Gotcha. Yes, that was what I was referring to as well. I don't think I was very clear in my original comment. I just meant if AWS doesn't offer M1's via Mac Minis that someone else will.