Just saying, the fact that "closed species" even exist as a concept should have been a giant red flag to you.
The fact is, "closed species" as a concept never made sense. If you wanted your super special OG species to be closed, you know what need to be done? You fucking don't show it to anyone outside your super special group, Of course, this runs contrary to the narcissistic behaviour of furries in general, who wants to be acknowledged for their "creativity". And so comes to the paradox of the idea:
You cannot copyright ideas.
But that's exactly what a closed species is: an idea. A vague collection of attributes that would make up your fictional species. The moment you publish a concept of this, the floodgates are effectively opened. You have exposed the idea to the world, and anybody can take it and use it to run with their own ideas. There's no putting the genie in the bottle. Imagine James Cameron trying to make his blue aliens a "closed species". He'd be laughed out of any Hollywood board immediately. The same applies to furries. By right, the very idea of having a super special closed species should have been mocked right out of the gate. But no. Instead, ironically, these furries took the most overzealous interpretation of copyright law and tried to enforce it on the community. That any use of this "idea" needs their permission and the implicit notion that they should be paid for some shitty collection of ideas that no one else would give the time of the day. I wouldn't say they succeeded, but they certainly built up a vocal minority who would defend this stupid concept. It's honestly fascinating that the very same "communist-leaning" furries, would also defend the notion of "closed species", an extremely capitalist concept, in the same breath.
So yeah, I don't know what you expected.