Lily Katz / Android Authority:

USB-C headphones were virtually absent at CES 2019, failing to catch on because of continuing compatibility issues and a lack of quality hardware  —  6.3K  —  In a sea of 3D audio products and true-wireless earbuds, USB Type-C headphones were nowhere in sight at CES 2019.

USB-C headphones were virtually absent at CES 2019, failing to catch on because of continuing compatibility issues and a lack of quality hardware (Lily Katz/Android Authority)
Source: Tech Meme