There. Now we know what you're talking about. Yes, I agree. The app does its best to get $90 out of you at every turn. One negative review states just that:
This app is a complete scam. As soon as you open the app it asks you to buy the premium membership which is 8.99/week. You can decline this and carry on with using the app. It then asks you to type your name, date of birth, and birthplace and requests that you hold your finger on the thumbprint scanner while it “searches” for your family. Then, in the middle of holding your finger down ON THE THUMBPRINT SCANNER it brings up the advertisement to buy the premium membership again. Now if you are like me and have set it to where you can pay for things with your fingerprint, you can imagine what happened. Because of the apps tricks, you accidentally purchase the membership without even wanting to. I had to cancel the subscription in the setting of my phone. All-in-all, terrible app and humans beware of these scammers!!!!
Your description of, I don't want to buy by asking to put fingerprint for identification, made no sense until reading this person's review. Now it does. They get you to put your finger on your iPhone or iPad's home button and immediately make a purchase for you.