There's a pretty significant difference in the amount of trust and commitment required for a one time cybering as compared to a committed relationship.

Cyber is kinky play, meant to be fun and arousing with the end goal of everyone getting their rocks off, so to speak. Essentially, it's like reading or watching porn that interacts. A quick throw down of each participant's limits and likes should be more than enough in the way of trust building for a one time cyber encounter.