You might not but a company will think twice. It's the same reason why companies could theoretically use pirated Windows and Adobe products and get away with it, but most don't because the risk is not worth the reward.
Again, you missed the point. LLaMA is under a non commercial license. I never stated it is illegal, just that a company will not want to violate license terms even if it is legal, simply because getting sued in a civil case is still a risk they wouldn't be willing to take compared to the benefit.