One option for this ( I think mentioned by someone before? )…would be to have a voting system for the taxon images.
If anyone who wanted to change an image was presented with the chance to add their vote to the different images, rather than simply swap them out, it would be a bit more slow-moving, less chaotic and in most cases the main image would probably rise to the top from a consensus of taxon experts.
I’ve also stepped into a taxon gallery war with someone inadvertently since the history came in.
I just left them to it as they were a new user and it seemed churlish…but they were consistently switching the photos back to suboptimal images …many of which weren’t even RG and looked likely incorrect in the first place.