That sounds hard to believe. What club threatened your friend ? Question is, how can they require payment when they can't provide the service that you are paying for.
If anyone has paid fees for winter and spring training/sessions/practice they should have issued refunds.
Summer payments are still in limbo. If summer is cancelled, I am sure there is a parent of one of these kids playing for one of these organizations that could put together a class action lawsuit. Unless the clubs do the right thing and refund payments.