From what I recall at the time Apple (as well as others) tended to do things to keep M$ OSs off their hardware and differentiate themselves from IBM so they would have more control of the platform and sell boxes. M$ goal was to be the dominate OS then. IBM misguidedly chose to make money on hardware. They were too accustom to getting exorbitant amounts for their software ie leasing it.
It was not so easy to port an OS back then and IBM PCs were the dominate species so too was DOS then Windows. Zilog was starting to fade also - the Z8000 never caught on. Apple became the only company keeping the 68000 alive. Motorola was not up to the challenge of competing with Intel or Apple was not making enough volume to make it worth their effort. Apple - fighting the last war - thought IBM was their competitor so eschewed any compatibility with IBM PCs and chose to go it alone. It wasn't until later (after Jobs return) that they realized they were wrong and things had moved on. Reasons for choosing a CPU where more about power and speed.
It was not so easy to port an OS back then and IBM PCs were the dominate species so too was DOS then Windows. Zilog was starting to fade also - the Z8000 never caught on. Apple became the only company keeping the 68000 alive. Motorola was not up to the challenge of competing with Intel or Apple was not making enough volume to make it worth their effort. Apple - fighting the last war - thought IBM was their competitor so eschewed any compatibility with IBM PCs and chose to go it alone. It wasn't until later (after Jobs return) that they realized they were wrong and things had moved on. Reasons for choosing a CPU where more about power and speed.
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