A fair use policy is a set of usage rules that limits how a service marketed as “unlimited” can actually be used. It may cap daily transfer, throttle speed after a threshold, or block automated or high-volume activity. In telecom and cloud services, the policy defines acceptable behavior even when the headline offer sounds unrestricted.
In cyber security, fair use policies matter because attackers often abuse “unlimited” plans for spam, credential attacks, bot traffic, or bulk data transfers. Providers use these rules, along with rate limits, anomaly detection, and account review, to detect abuse and protect shared infrastructure. For defenders, the key is to read the policy carefully: it can reveal hidden limits, logging practices, and conditions that affect both privacy and operational risk.