I read many sources on the correct usage of who and whom, like this answer. From that answer, it seems that you can always use who, I didn't know that.
However I would like to know if in this sentence I could use whom.
I would just use XX, but it is not me who is going to be using it.
A bit of context on this. I am building an app, and I am being requested to use something, lets call it YY, but I would much rather use XX. But since I am not going to be using the app, I am inclined to use YY as requested. And I was talking about the issue with another member of my team, when the sentence was produced.
I am not native English speaker, and I never did any sentence syntax analysis in English. I am not sure if this sentence is properly written.
I think in this sentence It wouldn't be correct to use whom, because I think who is the subject of this sentence. But I get confused because I start saying "it is not me".
I am thinking that maybe this sentence is not grammatically correct and that is why I am having issues identifying whether to use who or whom.
Is this the right way to write this sentence?