the only free cheese is in the mousetrap

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the only free cheese is in the mousetrap

proverb Nothing is truly free. Everything comes with conditions, however hidden or unseen. A: "There's no way this service is actually free—they have to make money somehow. The only free cheese is in the mousetrap." B: "Yeah, I bet this is only a free trial and that they'll charge your account once it's up."
See also: cheese, free, mousetrap
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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