The DES has reached the end of its useful life, and so has any software package that relies on it. Some people buy it when they forget their password for their own files. Law enforcement agencies buy it too, so they can read files they seize. In some ways, cryptography is like pharmaceuticals. Its integrity may be absolutely crucial.
Bad penicillin looks the same as good penicillin.
The ciphertext produced by a weak encryption algorithm looks as good as ciphertext produced by a strong encryption algorithm. There's a lot of snake oil out there. A lot of quack cures. Unlike the patent medicine hucksters of old, these software implementors usually don't even know their stuff is snake oil. They may be good software engineers, but they usually haven't even read any of the academic literature in cryptography.