Now anyone can record high quality music at home. Anyone can self publish their music for the world to enjoy. Both were unthinkable a few decades ago.
But there are still a few gatekeepers, and gatekeepers will usually charge for opening their gate. Why wouldn't they?
A megastar can choose to record any of dozens of equally good songs. Whoever they choose will sell 100x more. So in one sense it's fair they get a share of the money they create by adding their fame and talent to the song.