According to the author, Legal Ipsum was created for "those times when you need some legal-sounding gibberish but don't have the budget to hire a lawyer at $400/hr." I imagine for the majority of the world, not having a budget to hire an expensive attorney is all the time.
The user only gets a paragraph parameter with an odd set of options: 1, 2, 3, 5, 8, 13. That means if you want 4, 6, 7, 9, 10, 11, or 12 paragraphs of legal ipsum, you will need to hack the URL. There also appears to be no limit to the number of paragraphs one can request. I stopped at 1000 in an act of web server kindness. With just one one paragraph parameter, I would have expected an auto-submit on change to prevent me from having to click the button.
You could clearly use the text for purposes other than design. Try using some of the text on a fake letterhead and sending to someone you don't like. In fact, I may send some legal ipsum to my ex-wife's attorney today.