[planetguy]

> Typically service, when used in this context, implies that you do something for somebody else at no or little benefit to yourself

And in another context it just means "serving". So it's silly to call it an oxymoron when it's quite easy to be an involuntary servant. In fact, involuntary servitude has a long and proud history, it's called "slavery".

[sp332]

Or you could get paid for your service. That's not "volunteer" work but I don't think it counts as involuntary :)