From the final rule, "customer" is defined as "...and any individual who...opens an account for an entity that is not a legal person, such as a civic club."
I may be wrong, but it seems to me that the bowling alley employee is the customer, according to this definition. Definitely not logical, but we're dealing with regulations.
If I am right, this might be a good time to have a talk with the bowling center management about changing this practice. Most fall/winter leagues will have started by 10/1, so hopefully it wouldn't be a major change at a critical time.