Who started “The Sneezing Baby Panda”?

Unaffiliated YouTube uploader, on YouTube, Nov 6, 2006. It reached 6 platforms in 10.3 years.

LineageContestedKey steps, 12 of 16. Lines follow time and platform
Unaffiliated YouTube uploaderFirst postTech DigestPressSouth ParkTVPressOwner responseCommercialBacklashCommercialBacklashPlatform jumpMilestoneAfterlifePatient zero