e6ai is a derivative of e621 with the same management and parent company, so why are the rules different?
e6ai has rules against cubs, realistic renders of ferals, and realistic renders of humans.

Are there legal reasons behind this, or is it the moderators/company curating a less controversial community and content pool?

Is there anything stopping anyone else from creating a booru that hosts such content?

e6ai is a derivative of e621 with the same management and parent company, so why are the rules different?

This is true, the way ive seen it and some of the other management has seen it is a case as "It takes (example) a real person to make 1 piece in a hour to days while AI can make 100+ pieces under an hour" It's pretty much boils down to having the ability to make whatever you want in a matter of seconds. We strive and expect the user to have some effort in their work as it CAN be achieved rather then just typing a tiny prompt and thats it.

e6ai has rules against cubs, realistic renders of ferals, and realistic renders of humans.

Are there legal reasons behind this, or is it the moderators/company curating a less controversial community and content pool?

As for Cubs, i couldnt answer this question to you other then what I said up there having the ability to create whatever you want in a matter of seconds. For ferals mega sites like Google. Bing will take action towards realistic ferals as it could be mistaken for Zoophilia by someone of the law such as a investgator. This could lead to an issue that they don't understand how realistic images can get and deem it as real. Now for the people it's basically like the very off chance that someoen uploads a human male doing something and someone just so happens to look like them. In theory they could sue for various of reason while using that images as a "this looks like me doing things id never do!"

Is there anything stopping anyone else from creating a booru that hosts such content?

Other then the legal reasons? No not really it just cost money, power, servers, dev to run.

Do note take this with a grain of salt I'm just a humble Janitor and I don't know the specifics other then what has been passed around from E6 itself and just general legal knowledge.

Hi friend. I think Slop covered it pretty well but I'll fill in some of the gaps.

e6ai is a derivative of e621 with the same management and parent company, so why are the rules different?

Like Slop mentioned above. AI generated images must be treated differently than traditional art due to the low bar for entry and the speed at which they can be produced.

e6ai has rules against cubs, realistic renders of ferals, and realistic renders of humans.
Are there legal reasons behind this, or is it the moderators/company curating a less controversial community and content pool?

• Cub/young rule is a complicated question to answer. It's not currently illegal but that is likely to change in a few years and we are trying to get out ahead of that.
• Realistic renders of ferals rule is to avoid legal complications since you can easily with the tools available today generate images that are indistinguishable from real life images.
• Realistic renders of humans rule is to protect actual individuals. With how good stable diffusion is at generating realistic humans it's near impossible to tell if a photo or deepfake of an actual person was being used.

Is there anything stopping anyone else from creating a booru that hosts such content?

Nope! And there are other boorus out there with basically zero quality control and who allow content we don't allow. If you feel like you'd rather find your fortune elsewhere then that's perfectly fine.

Regards