I have not yet seen an app that charges you like 1 cent per hour. I would totally put in my credit card for an app that agreed it would only charge me 1 cent per hour. And then for an email app or movie app that I went nuts on, it would end up charging me $0.20/week or $1/month. Or 2 cents per hour. Or 10 cents per hour. They all feel cheap. And apps can monitor your usage.
I don’t like flat monthly fees because I don’t think I’ll use the app much and then I’ll forget to cancel it. Remove that worry and you can have my credit card number.