Otherkin Reiki still exists. It's not a single movement or anything like that, although I suppose there are/were several specific folks who have been the main workers. But really it's just a descriptive term for the fact that it's been observed to change and mutate and generally not follow the rules when otherkin get a hold of it. See OtherkinReiki, Open Source Reiki, The Tapestry of Worlds Attunement, and Jarin's posts on the topic on his website Dreamhart.org.