Why is doxxing legal?

I'm curious to understand why doxxing, the act of publicly revealing someone's personal information without their consent, is considered legal in some cases. Could you elaborate on the legal frameworks that govern doxxing, and perhaps explain why there seems to be a grey area when it comes to the legality of this practice? I'm specifically interested in how laws vary across different jurisdictions and what factors influence whether doxxing is considered a crime or not.