There’s a lot of science fiction where the rules of the world are defined by the author. I think the difference is that the foundation of science fiction is on what the world is, both literally, and metaphorically, while the foundation of fantasy lies upon what the world could be, hence the name fantasy
Do you see people with the Unsalted decals as well? There are a ton of those here in Michigan, with the same font, and I’ve seen them in surrounding states as well. Maybe the areas on the border should get Brackish stickers lol