If the problem is a lack of understanding of the status quo, then it isn't fair to criticize Apple alone. People ought to demand answers about the state of server-side scanning from Facebook and Microsoft and everyone else that employs PhotoDNA as well. The most popular article submitted to HN with "PhotoDNA" in the title garnered hardly any interest at all, even though someone there implied that a hash collision might be possible five years in advance.

https://news.ycombinator.com/item?id=11636502