Most of the Youtubers I've watched have either American or British accents. Although I don't think accents should matter. As long as you can understand the person you're watching, it should be fine.
Because I grew up watching a lot of American media, I seem to have adopted such an accent as I learned English, but when I edit my videos, I notice that I still have a light Eastern European accent, and even though accents don't matter to me that much, it kinda bugs me, when I hear mine. It feels close to an actual American accent, but not close enough. I hope that doesn't turn away some people from my videos.