Another consideration apart from the platforms the devs are required to support (meaning investment of time to install and understand), is the underlying architecture.
While certain platforms have emulation for x86/x64 support on other architectures, meaning one could run earlier versions of Poser (prior to 11.3/12) on macOS (just another flavour of Unix under the hood) in a Windows emulator, such as Parallels, etc., if the underlying CPU was Intel.
Indeed, that OS supplied emulation (i.e. Rosetta2) also allowed Poser built for x64 to install and run in virtual Windows within Parallels on actual ARM CPUs (M1, etc.).
That worked right up to the point when it was decided to restrict OS support to later macOS versions, plus prevent the installation of Poser on any system which identified its CPU as something other than x86/x64 architecture.

Prior to that, macOS on ARM could run the Windows Poser in a virtual environment while emulating x64 without any problems. Since then, it will not even install.
Of course, that doesn't apply to macOS Poser on ARM, thankfully that's still supported, but it was only a decision to neuter the installer which prevents Poser running in Windows on ARM, as far as I can tell.

Admittedly, this isn't Poser on Linux, but that narrowing of the platform support avenues indicates the likelihood of Poser on Linux, IMVHO.

Though I would prefer it to be otherwise, it seems that avoiding the burden of supporting additional OS/Architecture combinations is a reasonable course of action by Poser's current development team.

As further disclosure, I have had numerous Intel based Mac workstations with multiple boot partitions, including both Linux (RedHat) and Windows 7/10.
None of the ARM Macs I own support booting from a Windows partition directly, but Parallels and other VMs do provide that option (including Linux if I choose).
Again, prior to the Poser Installer restriction, they could also run Poser in Windows under Parallels on ARM. With the Windows beta programme enrolment, even Windows on ARM might be possible on the Mac ARM hardware, but Poser will no longer install if the installer fails to detect an x64 CPU.

Fingers crossed that one day, all such restrictions will vanish, and Poser can co-exist with Doom on a Raspberry-Pi running Linux ;-)

---

My ShareCG Stuff

Verbosity: Profusely promulgating Graham's number epics of complete and utter verbiage by the metric monkey barrel.