Welcome petthefabric! As oksewglad said we make our own rules here and no one is going to toss anyone out or hit them with a PIG (project in a bag) for doing things their own way.
For my own self, if I intend to get rid of the box marked Probably Never Finish once it is full or once I have sorted my UFOs, then I would count them gone. But then I would not call it Probably, I would call it Pass These On. LOL.
If I intended to keep the box, and maybe finish them one day, to me they would still be UFOs; they would just be very low on the priority list for finishing. And believe me, I have a few of those. OK, more than a few. LOL
That is just how I do it. You are free to do it any way you want to. When I gave one of my UFO's to my Sis-in-law, I counted that as a finish. It was gone from my pile! When I took a UFO with only a few blocks done, I turned it into a tablerunner and re-stashed the rest of the fabric which I had not cut yet. Another finish! A UFO doesn't have to end up what it started out to be.
If you have a UFO you might want to repurpose but are not sure how, or what, don't be shy about putting it up here with a photo or two and asking for suggestions. We are very helpful and creative..... especially with everyone else's UFOs.
Hugs and smiles and whoooo whoooo... welcome aboard this train!