Not pointing any fingers, but I've been told I'm 'begging' by sharing a fundraising page, asking for help.
Is there somewhere appropriate for such a post?
I've searched high and low, eventually opting for communities where it (to me) made sense to post.
I would probably recommend trying Imgur. You need to link a phone number to the app when creating an account, but that actually helps cut down on bot traffic a lot, so it's pretty much all real humans who will see your posts.
One user on Imgur that I see post often will put up a whole gallery of wholesome memes, then a random Go Fund Me link at the end just to help them get attention. I can't say how effective it is, but it sure does get visibility once it hits the front page. Maybe try something like that but with some pics and info about your kitty?
Good luck, I hope you get the help you need!