“Think free as in speech, not as in beer.” – Richard Stallman
“Free as in speech” means no restrictions on your activities. Libre. Liberty, freedom, do as you like.
“Free as in beer” means you don’t have to pay for a thing. Gratis. Free beer, open bar, help yourself.
“Free like a puppy” means you don’t have to pay for a thing, but there’s a cost that comes with having it.
Sure, take the “free” puppy. Now you have to feed it, walk it, and pick up after it.