There are several sets that I took pictures of when I owned them that were subsequently sold on at meets such as RWB.
It was in my collection at the time of being included into RM
Here is an example:
https://www.radiomuseum.org/r/mullard_mas375mas_37.html
What if the new owner wants to load pictures of their set? which was my set?
Providing there was a new uncovered angle or the set has been restored I don't see why these new pictures would be a problem.
You need to have a look what is already there and use common sense to see if it fills a gap.
Some sets I have moved on now belong to other RM members.
I know that there are people who love restoring vintage radios but have no collection at all, they just like to repair and restore then part with it and move on to the next one. I see no reason why non collectors should not upload their sets whilst they still own them
I do not agree with using pictures from other sources and not acknowledging where they came from. Such practices have no place in RM IMHO.
Cheers
Mike T