How is this not completely true of every service?

If Facebook sees it fit to prevent you (the developer) from accessing your FB specific user base for any reason / violation there is nothing you can really do.

If Google sees it fit to prevent you (the developer) from accessing your Google specific user base for any reason / violation there is nothing you can really do.

Worse

If Gmail sees it fit to prevent you (the developer) from accessing your Gmail specific user base for any reason / violation there is nothing you can really do. Gmail already does this occasionally by quickly blacklisting non Gmail senders in their spam filters.