The old fashion way, manually, searching through each and every page.
Doubly good catch, then. I've caught copy/pasters much the same way, but it was never moronic paraphrasing like what you found here--that makes it harder, unless you're reading very closely.
Also, did you report these knuckleheads? It's a pet peeve of mine when people who make good catches like this don't report or don't say that they reported them. I'd be happy to, but I won't if you've already done it.
Changing a few words is still stealing the idea of the original author.
It absolutely is. I understand why they do it--most of them probably can't assemble English words into anything that resembles a coherent sentence, so they have to change and reassemble sentences that already exist. Sadly, I think this is a cultural thing with a lot of them. They just don't think it's wrong to do this.
By the way Flying Hellfish, you left the Chipmixer campaign already?