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".