No such thing as a free lunch?
My Father used to say this a lot. "There's no such thing as a free lunch". I never got the meaning as a child...all my lunches seemed to be free? Sadly, he passed away when I was in my teens, so I guess I never really understood the real meaning until later on in life.
Of course, I think I understand now. If you are offered anything for free then there is usually a "catch" of some sort. The catch might be an associated sales pitch, or a later charge for something you don't really want or need, but forgot to cancel because someone has your card details. I've been a victim of this myself, so would not inflict this approach on others.
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