But if you hadn't made that one comment you'd be a few views down and a subscriber down?
Usually, the commenting thing works if you regularly comment on the same sort of videos. Because someone might watch 5 different YouTubers and see that you comment regularly on all them five and be like "I wonder who this person is, they seem to be into the same YouTubers as me and their comments are usually pretty cool".
Thats how I find accounts, I tend to watch a few videos and if I see a username that looks familiar I get curious. Usually it looks familiar because they are commenting everywhere, but then I end up seeing if they create content etc.
But when I +1 comments, I tend to be just searching through the comments rather than curious about if this random commenter has videos or not...