People mostly don't care about the composers/producers of modern pop music. But if you want to find out it is really easy on all music platforms (Spotify, Youtube music etc).
Being a performer and a composer is a very different skill set and a very different business model.
Also, it is very difficult to compare the amount of fame of someone in 1800 vs someone in 2020. I am not so sure being a composer was ever a "public facing profession".
Modern pop musicians have almost all of their work written by people who are intentionally kept in the shadows.
Being a composer is not a public facing profession anymore.