If Apple wanted to, they could already do that right now. Windows runs on arm just fine. Heck, windows on Arm in a parallels VM runs better on my macbook pro than it does natively on an x86 laptop.

If Apple would make some drivers, even just for Windows, I bet they'd sell more macs. But it would seem Apple either calculated that ecosystem/services lock-in is way more important to them than a potential boost in hardware sales for alternative OSes, or they are really reluctant to make drivers for Apple Silicon available elsewhere out of fear it'll expose some trade secrets, which they didn't have to worry about when they used intel.