The most obvious application would be faking criminal exhibits. Fake photos prrofing something
RAW files generated "backwards" do already exist. For this, police and forensics have been using special cameras with hardware signatures for raw files for around 15 years, but Canon's and Nikon's system was broken by Elcomsoft like 12 years ago. Sony is trying something similar in their A7 IV, but I don't know how serious it is, and I think it's not as oriented to forensics as Canon and Nikon was.