at these points, these cable cuts are more dangerous than actual bombs
Also: Internet cables today, essential power distribution cables tomorrow. Infrastructure is fragile, and human lives will eventually be at stake.
Especially as navies are just fundamentally not constructed to defend extended things like a cable: starting a war over them is the best way to ensure every cable is cut.
Cables getting cut is only dangerous because it’s an escalation that may lead to bombs. There aren’t thousands of civilians dying because Finland doesn’t have high speed fibre to Germany.