The IP you normally would have communicated with is among the hijacked IPs, then you have exposure. The data you send to such IP is ending up in the hijacker's

The IP you normally would have communicated with is among the hijacked IPs, then you have exposure. The data you send to such IP is ending up in the hijacker's hands. As an end user, your only defense is to use end-to-end authenticated encryption between you and your intended other end-point. The authenticated part is very critical in this case.