Yes, it is. However, this is not a complaint but a question that I, as a potential customer, have. I don't care that it can be reversed generally. I only care about how they plan to protect me as their client. It is a direct and fair question to ask from such platform.
Most of these platforms use a third party payment gateway which stores your banking information and are generally compliant with Govt's guidelines for storing sensitive information and have safe measures in place for breaches.
ACH is reversible so fraud can be reversed generally.