The issue isn't whether they do it routinely, but whether they're entitled to do it. Most small companies hire people using boilerplate employment contracts and employee handbooks, too.

My point is that they don't have to intend to make monitoring possible for it to be possible; it's practically the default.

Also: pay close attention to what 'Spook23 is saying downthread about discovery. Your employer doesn't even have to want to monitor your stuff; all that needs to happen is they get sued, and if you've been mixing business and personal comms, it can all end up in scope.