The current rumor is that Apple is open to Microsoft doing it, and that Microsoft has an exclusive license with Qualcomm for ARM windows. This license expires soon.

> "that's really up to Microsoft," [Craig Federighi] said. "We have the core technologies for them to do that, to run their ARM version of Windows, which in turn of course supports x86 user mode applications. But that's a decision Microsoft has to make, to bring to license that technology for users to run on these Macs. But the Macs are certainly very capable of it."

From: https://arstechnica.com/gadgets/2020/11/we-are-giddy-intervi...

Exclusivity deal rumor: https://www.xda-developers.com/qualcomm-exclusivity-deal-mic...