Basically, what every other anon has said, it depends. If it's someone like Vinesauce Vinny, Oney Plays, or Jerma, it's probably because the audience finds that person entertaining to watch. On the other hand, with Vtubers like Dola and Saegusa, there's a good chance some lonely man or woman is watching them and pretending they are their waifu or husbando.
Oh yeah? Bet you won't be saying that after I hold your hand. Twintails are one of those things that I like seeing drawn, but find unattractive in real life.
>The internet is a supernormal stimulus, it gives us things we couldn't hope to find in nature. You can use that as a force for good and have a fun time, or you can get hooked on it like a drug
You've got it. Furthermore, the internet, as well as social media, amplifies things. For example, if you barely use the Internet, how many weirdos or severely autistic people do you think you'll meet in real life? Chances are, you'll only know about the kids that took the short bus, if you went to public school, or the odd aspie you might have at your job. For better or worse, the Internet has allowed us to see people like Chris Chan, Drachenlord, and so on and so forth.