why would they want to?

Probably not, since IME/PSP is what allows them to perform unattended reboots, remote BIOS modification and all the other wild VPS features we take for granted these days.

That isn't true for AWS, the nitro card is used for all that jazz.

Those features are probably of zero value in that implementation scheme for the big clouds. Those are more the kind of things for small datacenters and 'hosting providers'.