> This doesn't make a data breach or data sharing avoidable/impossible.
this risk will always be present. Choosing a well known processor will reduce it quite a bit imho.
If you're asking why a user would take on this risk, i would say that they are getting a "free" trial in return. By having to take on this risk, the user is more conscious of using the product, and cut out the people who would just kick the tyres.