I think the OP’s comparison of deepfakes v piracy to be appropriate, but maybe misses a significant facet of debate.
If someone makes their living doing porn, then non-approved deepfakes can take money out their pocket. If a person has a conservative mainstream brand or persona, then deepfake porn could have a negative impact on that brand–which translates to an economic loss. Either of those losses could result in a civil suit.
So I agree with the OP in this scenario when you compare the potential for legal action against the site (piracy v deepfakes). ES has controls in place to mitigate the risks of piracy posts (no torrents, no actual hosting) and I believe those controls are also applicable to deepfake posts.
However…
Many consider deepfakes immoral because of the impact they can have on the person depicted. If someone doesn’t want to been seen while nude or performing intimate acts, then deepfakes depicting those scenarios can trigger the same emotional reactions/trauma that the actual occurrence would have. Embarassment, stress, anxiety, panic, depression, PTSD, etc could result. Granted, some may be able to dissociate and mitigate the impact because it is fake, but others won’t.
So if nonconsensual “real” porn (revenge, voyeur, blackmail) can be considered immoral because of the trauma it can cause and nonconsensual deepfake porn can have the same impacts, then is there grounds for ES to label both as “unethical” and bannable?
Morality is subjective and that’s fine. I’m not trying to preach or convince you to boycott/cancel/soapbox or whatever. Frankly, IMHO, “immoral/unethical” content can be some of the most exciting porn. I’m just pointing out a “why”.
Cards on the table, I’m not really into deepfakes–I don’t fantasize about mainstream celebs or people I know IRL, so deepfakes don’t really scratch an itch for me.