We have helped a few customers recently who have inadvertently installed malware or spyware after visiting a website or receiving a call pretending to be Apple. They were advised their Mac was locked, slow or infected by a virus. To resolve they need to pay for support and/or to install software.
Apple has announced changes to it's macOS Server app to be unveiled in Autumn 2018. The updates will focus on management of computers, devices and storage on your network. They will also be removing several services which may affect a number of small businesses.