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Most of these were made by hobbyists and the quality wasn't good though. There are just not many porn companies who invest in AI porns. The only exceptions that I have seen were Japanese companies. For example, 二階堂めろ is an AI porn-star. However, they seem to be just using deepfakes to change the face of a real human actress, and the result wasn't really that impressive.
You can also find some related discussions in this thread:
https://forum.sexlikereal.com/d/3289-why-dont-we-get-into-private-deepfakes