Everything has a cost.
There is a rule in accounting. All transactions have a debit and a credit. You can’t do one without the other.
To call something free is to dismiss the “credit” side of a transaction.
If you just saw half of the movie screen, your imagination isn’t going to replicate what happened on the other side.
That “free” lunch?
You gave up time, money, or another resource to make it happen somewhere in the chain reaction that got you to that restaurant table.
When you dismiss a part of the equation, you miss the picture.