Why do I think they are more successful?
Because they are performing songs that a lot of people like. My two daughters both like Ezra & Styles and have been playing them non stop this year - as have most of their friends when they come around. They are also into other artists (like Dua Lipa) but this year they seem have latched onto Ezra & Styles and download their music.
They have a choice of a lot of artists, but have chosen them. No one is telling them to do it or pressuring them into doing it - they are choosing to do it as they like the music.
If this is repeated around the country, you can see why they are successful.
Why do you think they have been more successful?