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by LinuxBender 1726 days ago
Shodan scans a handful of common ports [1] but you are right, a targeted attack will not be stopped by moving ports. Along the lines of what jms703 mentioned, moving ports just removes the noise from the bots so you can have better alerting on real attacks and not suffer from alert fatigue.

[1] - https://en.wikipedia.org/wiki/Shodan_(website)