Claiming to be a "friendly, welcoming space for all kinds of furries" and then excluding anyone under 18 is honestly quite shitty. If you wanna run an NSFW-focused community that's fine, but say that up front and don't pretend you're all-inclusive.
There's a severe lack of non-age-restricted furry spaces in general, and especially ones that aren't actively sex-negative & anti-queer.

That shit really hurt me and made me feel like I didn't belong when I was younger. I was isolated, I felt like I was broken and wrong and bad for being myself, and I'm still working through all of that. I'd rather not have more socially-rejected queer kids suffer the way I did. Let's show them a little compassion. Please.