It it literally in the Wikipedia article https://en.wikipedia.org/wiki/PhotoDNA https://en.wikipedia.org/wiki/PhotoDNA “ It is used on Microsoft's own services

It it literally in the Wikipedia article https://en.wikipedia.org/wiki/PhotoDNA https://en.wikipedia.org/wiki/PhotoDNA “ It is used on Microsoft's own services including Bing and OneDrive,[4] as well as by Google's Gmail, Twitter,[5] Facebook,[6] Adobe Systems,[7] Reddit,[8] Discord[9] and the NCMEC,[10] to whom Microsoft donated the technology.”