@Toksyuryel Of course it's possible to report them. You report the image, then put "a BP is vandalizing the tags in this image and in images X, Y and Z" in the explanation.
And how would the site know what images are "affected" and block anonymous editing? How would it know that
these tag edits are vandalism? The only way would be a mod to mark the image as affected, and mods can't do that if they don't know about the situation. The only way they know is if you… report the image.