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We translate them into English using Microsoft/Google Translate (which is what you need to do in order to compare between languages) so the meanings may not be quite so easy to compare (because it relies on the current state of the art of machine translation of language - still not at professional legal translator level).

That's a really interesting point about detecting lobbyists, although my first thought is that most language similarities will be due to international treaties.

I'd also be interested in seeing which jurisdictions have copied from each other. Maybe there are "leaders" in developing laws.

As for completeness: it relies purely on laws that are published online, which is always not the complete corpus, even for advanced countries.