They still think of themselves as a hardware firm, this restrains usage elasticity to a level where system hardware scaling is a dominant cost driver rather than system performance. Besides the inefficiencies of physical space at AWS sites, it is also a fine business for the cloud provider as it generates a less volatile usage pattern than normal. As Apple is acting as a monopolist by dictating the same terms to everyone, they further remove any competitive advantage of providing anything else.

They just updated it two weeks ago. There's no reason they would change their mind again quickly.

They do this very intentionally. If they wanted to be available on AWS they'd allow OSX to run in a VM which they don't.