I've only once encountered piracy on Aeronautical HF. On the way south to the Malvinas in the mid-80s some hispanic accented voice kept trying to interrupt routine position reports.
The 6 MHz band was full of pirates when I was a student in London in the early 70s; I occasionally used to listen to them on a SW receiver but didn't see what they got out of it as in those days a heavy fine and equipment confiscation were highly likely for unlicensed operators.
Someone using an illegal Band II FM baby alarm kept jamming my FM reception once; I rang the Radicomms Agency but they weren't interested. Once upon a time the Post Office Radio Engineers would have been round like a dose of salts......
CB could have been very good in the UK, but was introduced very poorly with no requirement for official call-signs and equipment which was both unique to the UK and was restricted by inefficient antenna restrictions. Unfortunately CB was ruined by kids playing music on it and generally abusing it; I've no idea what it's like now but there are now 80 channels, the antenna restrictions have been relaxed and it should be a useful and very cheap comms system - particularly since kids now use mobile phones, play computer games etc and probably don't cause the problems they used to in the early 80s.