Why does korean spamming on most fourms?

I seen most fourms such as Minecraft fourm, Orchid fourms and other website fourms there most spamming by korean

Here pic: Why does korean spamming on most fourms

Added (1). Is a korean bot?

Here another fourm: Why does korean spamming on most fourms - 1

Sienna Ansley 07.03.2016

/ Climbing supplies permanent discount stores
and for try44.com or dt300.com, I'm not sure if they're spam or part of the ads

and the 2nd link, there's KIWOOM

Guest 07.03.2016