This week’s Cybercultural newsletter looks into internet platform dominance in the cultural sectors. I examine three recent news stories on this theme. In the first one, YouTube’s bullying tactics over its competitors and partners are laid bare. But two other, more positive, stories show how challengers constantly arise to take on the big internet platforms: TikTok is the latest Next Big Thing in online video, while newly funded newsletter platform Substack is helping creators route around social media.