Scarfoxes, Grems, and Cinnadogs are some of the worse closed species. Scarfoxes are usually upwards of a couple of hundreds to thousands of dollars to get and their fans will attack anything even with large scarf hands as being a fake scarfox. Grems are generally shitty and will now permanently ban/blacklist you if you void a grem from being in the species (Basically saying you no longer want them to be a Grem and don't want them on the masterlist) even if you made the design yourself and not the owner or a guest artist. Cinnadogs I've heard the owner of has had a bad history of design theft, character revoking, and generally tism fits that makes the species a nightmare to deal with.
Some CS communities are better than others but that doesn't stop from how unoriginal they usually are. It's even joked about by some owners and then some owners will get so offended by rip off/off brand species they will blacklist from do anything of that species and people who own it.