There is also work going on for deepfake detection challenges since years, I think forensics benchmark was the oldest one and other two placed at 2019 , I dont know if forensics still going on though

http://kaldir.vc.in.tum.de/faceforensics_benchmark/

https://www.kaggle.com/competitions/deepfake-detection-chall...

https://ai.facebook.com/blog/deepfake-detection-challenge-re...

edit*: looks like yes forensics top submission 25 Nov, 2021