The most successful Linux distros are ones that normal people are not aware they use at all. Most people dont install operating systems, they just use whatever comes with the device. To them its an appliance.

Android is a flavor of Linux and is widely successful. Ive seen libraries use Linux and a browser and the machines worked for decades. And there are quite a few Amazon tablets, ebook readers, etc... all using linux.

Theres a never ending number of examples out there.