I'd categorize fiber cutting under attacks on business continuity. So do other forms of denial of service attacks, like interfering with power supply. Yes, the easiest way to protect commodity infrastructure is redundancy. And while an instant total blackout is unlikely, continuous strikes are a problem (compare to electricity networks in Ukraine). Redundancy is costly, especially for long cables, where attack surface compounds into the costs.

Eavesdropping is an attack on business safety. So is injecting misinformation or altering messages. For data, encryption (and authentication!) mostly solves these issues at pretty low costs and I think that where this matters it is mostly covered.