These viewers are useful for attracting real viewers … and for classifying your live stream.
People tend to ignore live streams that have no or few observers, but if you get 20+ … it's different.
Also, YT tends to avoid classifying live feeds with no or few viewers.
Once the live is over, you can also watch your video. This is not a guarantee, whether you are there or not.
Works wonders for live reviews, sponsored games, gifts, and more.
Would you be interested in such a service?