Worse than that: other than Apple and the clones, there were hardly any PPC OEMs at all, and Old World Power Mac hardware wasn't PReP (which is why it couldn't run it). Largely only IBM's hardware could, like the rare as hen's teeth Power Series ThinkPads, or the unobtainium Power Series workstations, and some of Motorola's equally rare stuff. Those landed with a thud in the market and were extremely expensive, and it made sense for Microsoft to jettison it.

Apple was going to get NT on at least the Apple Network Server (Ellen Hancock once claimed there would be upgrade ROMs that could boot it), but that never happened.

Alpha, at least, had vendors, and existed in some numbers. My AlphaPC 164LX [0] was made by Samsung.

[0] http://oldvcr.blogspot.com/2023/03/refurb-weekend-dec-alphap...