Should we offer a free 7-day trial A/B test I will not promote

So many book summary apps offer a free 7-day trial, so we wanted to try to see if it works for us. For 50% of website users, we offered a free 7-day trial that required a credit card. For 50% of website users, we offered 2 free summaries upon login instead of a free 7-day trial. We noticed that 60% of users who were offered a free 7-day trial provided fake credit card numbers or credit cards that couldn't be charged 7 days later. We made more money from users who were offered 2 free summaries and then had t