Not only DNG, but I think most (maybe all?) raw camera files are based on TIFF.

The top 3 (Canon, Sony, Nikon) are all based on TIFF, and that accounts for the majority of the market share. Search for "TIFF-based" here:

https://exiftool.org/#supported

Not the .IA files from old Sinar digital backs! Those are based on DOOM PWADs (lol). But otherwise mostly yes this is true for nearly every other format as far as I am aware.