RapidZapper
I made a small study on what you mentioned. But it seems like it is brands like Samsung is not providing a seperate share feature for regional issues but for a faster sharing experience within their ecosystem.
I also checked the regional restrictions. Samsung gives a seperate sharing mechanism by integrating with other brands to provide them similar features.And the purpose of a seperate Samsung share feature is not because of a regional restrictions.

This is what I could understand after making some searches on this case.
I am aware that CMF is also in the ecosystem of Nothing. But considering the processor, and specs of CMF i wasn’t sure if it is capable of supporting these. But there are feature which is there in Nothing Phone’s and not there in CMF. So if Nothing is bringing something if they can involve CMF it’s well and good but it is not fair to not give a specific feature to other phones as a single phone can’t support it.
I also agree that NFC was an old method of sharing. But I mentioned it as an alternative because the NFC working with bluetooth in android version 4 it was bluetooth version 4 but now it has changed so there might be changed in speed too. Also nfc ws just a simple suggestion.


Here,
First feature is used by brands like oppo, vivo, xiaomi for their ecosystem to share files.
Second feature is used by Apple.
Third features is a rare implementation.
Fourth feature is used in Oneplus, Realme etc
Fifth feature is also used by Apple and Samsung
Sixth feature is also used by Apple and Samsung
Seventh feature is used by Samsung again


Nothing has a very innovative idea. Nothing is capable of bringing a new form of share feature for Nothing ecosystem. These are some feetures implemented by other brands. The hardware of Nothing is better known by the manufacturers than any users. So Nothing can bring something innovative with the existing hardware maybe.