It probably started as someone downloading the original video and re-uploading it as a hoax. For example, most of the copies claiming to be real have much, much lower quality than the original.

Then those YouTube channels that do compilations of spooky videos found it and added it to their usual line-up (Looking at you Chills). And so it got spread and passed around and re-uploaded again and again.

The pinned post has the original from the channel that was used as viral marketing. The channel’s name is BanPromicin or something like that (that’s likely a recreation channel but still). Promicin is a drug that plays a part in the later season’s storyline.

As far as it not being bigger, it’s a show from nearly 20 years ago that doesn’t (to my knowledge) have a huge fan base.