It is not dark pattern as such, but if you don't tell, it can raise a flag in terms of privacy and security. The response may very. Announcing it loud and clear

It is not dark pattern as such, but if you don't tell, it can raise a flag in terms of privacy and security. The response may very. Announcing it loud and clear is the good practice to avoid confusion and building trust. Also, if you probe the local network, do it only for the purposes announced and do not use/keep/share the data for any other purpose.