Head_Boy is referring to traffic bleed. As .com is the largest and domainant TLD, second level domains with .net/.org/.info/.biz/.whatever TLDs will in most cases lose varying degrees of type-in traffic to the same second level domain with a .com TLD. Certain second level domains with strong ccTLDs may have little if any traffic bleed to the same second level domain with .com
SomeExample.net will lose traffic to SomeExample.com
Some-Example.com will lose traffic to SomeExample.com
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