Inactive subscribers are people who interacted with your account, but never joined a List. Inactive subscribers /= Opt-outs. you can view these numbers by going to Subscribers > Export > and selecting "Inactive".
- Your Keyword is triggering an auto-response but not opting people into a List. Anyone who texts your Keyword will be an Inactive subscriber.
- Your Longcode is not opting people who text it to a List. When someone texts your Longcode, their message will be sent to your Inbox, but they will not be part of a List. They are an Inactive subscriber.