There are no technical limitations preventing this.

No technically limitations, just legal ones. Which are famously irrelevant to international commerce?

That's a good thing. The only thing these legal limitations protect are the american stakeholders and no one should care about them, they are already worth billions.

You cannot legally certify something as Zigbee with paying a fee. This is the same for Matter.

Then why did matter feel the need to lock it down technically?