Every market where a single provider is able to satisfy unlimited and global demand will be a winner takes all situation.
One youtuber can entertain millions of people while one dentist can only work on a few people per day. You may be the 100,000th best dentist but that doesn’t matter because everyone above you is already booked out.
Already booked out, and also locality matters a lot. On the internet, a live stream only takes <1s to reach me, while I have to find a dentist in my own area.
That’s just one dimension of it. If I’m a mega live streamer I can be servicing millions of viewers all at once. As a dentist I’m most likely to be serving 1.
One youtuber can entertain millions of people while one dentist can only work on a few people per day. You may be the 100,000th best dentist but that doesn’t matter because everyone above you is already booked out.