It's a pity the author didn't decide to offer a trial without attaching a credit card. I get it, we had these discussions here many times. But as a person that could potentially subscribe, I'm baffled at the choice.
You could argue that I'm not really willing to subscribe if I'm not willing to provide my CC details yet. But it doesn't work this way. Before I subscribe to a new service, I really like to know it well, to have a kind of emotional relationship to understand what it is giving/saving me. "Give me you CC or get off" makes me not even want to try.