If something that had already existed for 6 years when 4chan first opened can be said to originate from 4chan, then what can’t? Hell, large portions of internet culture as you know it for good or for ill were actually born out of the chaos of /b/, but your metric for “originating from 4chan” seems to be “do I think of it as negative and/or nihilistic, if yes then it must have originated from 4chan” rather than anything about where something actually started from.
If something that had already existed for 6 years when 4chan first opened can be said to originate from 4chan, then what can’t? Hell, large portions of internet culture as you know it for good or for ill were actually born out of the chaos of /b/, but your metric for “originating from 4chan” seems to be “do I think of it as negative and/or nihilistic, if yes then it must have originated from 4chan” rather than anything about where something actually started from.