They also switched from 14 days to 60 days if I remember TFA correctly. I might guess that "free trial" converts badly because people don't really invest and u

They also switched from 14 days to 60 days if I remember TFA correctly. I might guess that "free trial" converts badly because people don't really invest and use the product properly, whereas "money-back guarantee" forces people to (however temporarily) invest money in the product (and therefore they tend to spend the time to actually set it up and use it), as well as communicating more confidently that the supplier believes the product will add value.