How about promo-ing open ones instead? There are just as many open ones out there as there are closed ones, and their owners would probably be delighted to see others making art or characters out of their open species.
In that same vein, instead griping about similar appearing species and adopts, why not promo the ones that are, to you, interesting or different. Let people have their harmless fun, no sense in making people feel bad about what they like, that really just ruins it for everyone in the end.
And if you don't like the adopt scene at all then.. promo something else? Seriously, I don't get spreading animosity about something that doesn't hurt anyone. Honestly you're just going to make the followers and friends you have that do like that sort of thing, feel guilty for expressing joy or interest in it. Don't do that u_u