The questions with the homomorphic-encryption tag are often only tangentially related to the topics in the help center.
The help center says that "using cryptography" is on topic, but the homomorphic encryption questions are more likely to be questions about the properties of a homomorphic encryption instead of using it. These questions are better suited for Crypto.SE.
Homomorphic-encryption will be more suited here once it begins to get implemented in information systems. Until then, can we suspend or remove the tag?
Alternatively, can we change the tag info of the homomorphic-encryption tag to make the user to consider whether Crypto.SE is a better fit?