[chopsueyar]

Are they users or customers?

You cannot alienate customers that are not your potential customers.

The beauty of this service and the United States is that nobody is forcing you to use Chargify. Also, if you do use Chargify, you can stop at any time, without any penalty.

In fact, Chargify uses an API, so your application can be written in a way that competing and alternate services can be integrated into your application (without requiring major rewrites to your application).