There are no existing filters for spam or illegal content. That's all done manually when someone reports it.
Instances that use Cloudflare should opt in to their service which detects CSAM. It's free and easy. I've done that for piefed.social.
I've recently added some LLM-generated text detection to PieFed but it's not scalable as I don't have the hardware to enable it's widespread use. So I just use it in a very limited and targeted way at the moment.
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