Who are listed under “Non-Subscribers” filter?
The customers who do not have any single active subscription are listed under “Non-Subscribers” filter.
For Example:-
1) If a customer owns three subscriptions out of which all three are either expired, cancelled or marked as inactive then this particular customer will fall under “Non-Subscribers” filter as he does not have any active subscription at the moment.
2) A newly created customer without any subscription will also fall under “Non-Subscribers” filter.