About the free trial

I'd like to try the free trial, but I don't want to pay for the app montly. I just want to try it, not buy it. So why do I have to buy for something I don't want? At any time I can unsubscribe, I know that, but then why do I have to give you my credit card information? Why? I don't want to pay for your app but I have to so I can test it? So the free trial is a lie???? ugh.