That said, the "simple way around the paid API" problem is something Google has to deal with anyway, because there are a bunch of ways to use Google Translate without paying for it (e.g., the translate.google.com web UI, or the non-JavaScript-exposed "Translate to [language]" feature built into Chrome), and any action that can be taken by a human can in principle also be taken by a script. The only thing to do about it is use secret-sauce server-side abuse detection to block as much of this activity as they can; they can't get all of it but they can get enough to push enough people onto the paid API that the economics pencil out.