I’ve seen catbox.moe used around here quite a lot, and I’ve used it too, mainly for allowing hot-linking to embed media.

Patreon and Ko-Fi restricted Catbox’s account based on CSAM reports (assuming from the e-mails).
Ko-Fi has restored the account after providing information on the moderation of such content:

I responded to Ko-Fi with a bit more in depth of the systems Catbox uses to monitor uploads for malicious content, and they reinstated my Ko-fi account on Thursday, May 22nd.