I don't know what kind of site this is, so it's hard to say if it applies, but do note that several of these can significantly harm usability for legitimate users as well. For example, someone might be copy/pasting a segment of data into Excel to do some analysis for a paper, fully intending to credit you as the source; if you insert fake cells, or render the data to an image, you make their life a lot more difficult.

The first suggestion (AJAX-ifying pagination) can be done without a major usability hit if you give the user permalinks with hash fragments, though, so example.com/foo/2 becomes example.com/foo#2.