Yeah, this isn’t just joking or shitposting. This is the kind of shit that gets people locked up in federal pound-you-in-the-ass prison for decades. The feds don’t care if you sought out the CSAM, because it still exists on your device regardless of intent.
The laws about possessing CSAM are written in a way that any plausible deniability is removed, specifically to prevent pedophiles from being able to go “oh lol a buddy sent that to me as a joke” and getting acquitted. The courts don’t care why you have CSAM on your server. All they care about is the fact that you do. And since you own the server, you own the CSAM and they’ll prosecute you for it.