I tend to ignore requests like this when they come through my channel, or through the comments on my videos. I like to think of the comments section as a place to comment on the video, to engage with the creator and the viewers. I always read comments on other people's videos and engage in conversation that was led from their comment.
I don't mind doing this if it's over a creator's forum like this one, because we're all on YTTalk to grow, learn and be inspired by other creators and share experiences.