I have some facts from-
https://www.chargebee.com/blog/c...
Companies that require a credit card upfront have an average conversion rate of 2%, whereas those without credit cards can have a higher conversion rate. Totango reported trials with no credit card had an average visit-to-lead conversion of around 10%, though the lead-to-customer conversion was only around 15%.
Research by SaaS Customer Engagement Platform firm Totango indicates that companies who require a credit card at the time of sign-up experience extremely high conversion rates, with a reported average of 50% trial to paid customer conversions.