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It's profitable if you use other people's computers and don't pay for the wasted electricity. It's straight stealing though.

Depends on what you mean by profitable

For a modern top of the range CPU you can expect maybe ~5MH/s (likely even less)

If 1 million people install utorrent and have their processors mining constantly, you can expect a daily profit of about $14

As far as I know uTorrent has hundreds of millions of users, it's not going to be amazingly profitable, but still significant revenue. (I don't see any recent figures, but they were at 150m monthly users over three years ago.)

It could be a Bitcoin miner put in by people who don't understand how worthless that would be.

See: How people have found miners running on compromised NAS boxes and even DVRs.

yeah, Litecoin actually