Suspicious Blender channels on YouTube

This is a bit of a weird one. I was browsing YouTube to see some of the latest eevee demos, and I came across these three channels, all owned by the same individual, all having just one video but with subscribers numbering in the tens of thousands. These are clearly not channels created by this guy. One of them was created by a woman, and another one of them used to sell skin care products.

The reason I bring this up is because I came across this video yesterday about a YouTuber having his channel hacked and sold on the black market. My suspicion is that something similar is happening here.

I’m not bring this up to do anything about it. I’m merely curious about what is going on here. Do you reckon these channels were bought legitimately, or are there shenanigans at play here?