In YouTube, engaging with other people is one of the best ways to get your channel and videos seen. TubeAssist makes this happen by automatically leaving comments on videos that match your search phrase.
When you comment on another person's video, there are a couple important things that happen as a result. The first is that the owner of the video receives an email that you commented on their video. The email includes your comment as well as a link to your channel. Many of these people will click to check out your channel and if they find your content interesting will watch your videos, subscribe, etc. The second important thing to happen is that your comment is left on the video matching your search phrase. Many of the people reading the comments on that video will be interested in the topic and if they like the comment will click through to check out your channel. This also results in more views and subscribers.
As the days go by, your views, subscribers, comments, etc. will keep going up. Every subscriber you get today is one more person who will be notified when you upload your next video. So the number of views you gain multiplies the longer you run TubeAssist campaigns. You aren't purchasing subscribers (which is against YouTube terms of service) so you won't see 10,000 new subscribers over night, but unlike purchased subscribers, they are real people who will view and interact with your channel.