It just occured to me, if you click on a google image and it turns out later that the website is not free, do you still have to pay for that website?
And how are they going to charge you?
If an image that Google has picked up on an image search turns out to be from a pay site, and is a paid image, the link will take you to to an introductory or trial page to try to get you to sign up for their services.
So long as you have not given a company your credit card, paypal, or (eeegad) bank account information, they cannot charge you for anything as they do not have a way to do it.