Is it your interest to reach a greater range of viewers with your videos? Of course it is.
Portuguese speaking countries are notorious for, among other things, not speaking English (redundant, I know, bear with me) and therefore not really consuming much English made media (unless it's music or followed by subtitles).
So, here I am to provide you with subtitles for your videos, and I'll also translating the video's title, so that you can rest assured that people from countries such as Portugal, Brazil (these two alone make up for over 400 million people, that means 400 million new potential viewers, imagine the possibilities!), Angola, and many more.
So, what are you waiting for, your video won't subtitle itself.
In case of doubts, feel free to ask