1) It should not be used to collect credit card details.

2) If you claim to cater to professionals, you should not be using typeform for the signup process.

3) I am clearly not in the target audience, but I'll share my concerns : I would never use a service that hacks together a bunch of third party tools. It's great from the founders point of view (MVP, fail fast, early validation, hustle and whatever else), but it does not inspire confidence. Why? Security and privacy. God knows what poorly configured database, webserver or access control mechanism will leak user data since the product was built with the aim of getting something out of the door without much thought given to security and privacy.