Work device.
Both myself (school) and DH (solicitors) have to sign a document which states what we can/can't use work devices and work WIFI for, and the consequences of not following these.
Pornography, gambling, etc - whilst legal they are not permitted on our work devices and we can face disciplinary action, leading to eventual dismissal if we use work devices and/or wifi to access them. We are also not allowed to use our own devices, even if using our own mobile data, to access such things whilst in the work premises or in contracted work time. This is pretty normal for most people I know.