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Microsoft makes some very good quality adaptive controller accessories. IMO that still doesn’t make this move OK, but at least disabled people still have a supported option.
https://www.xbox.com/en-US/accessories/controllers/xbox-adaptive-controller
Epic Games*, Mihoyo**, IO Interactive, Bethesda/ZeniMax***, Deep Silver.
* Epic games is 40% owned by a publicly-traded company, Tencent.
** Mihoyo filed for an IPO in 2017, but withdrew its application for unknown reasons.
*** ZeniMax Media was recently acquired by Microsoft, and is now a Microsoft subsidiary. I’m not sure if this makes it count as a ‘non-public gaming company’ by your definition.