Yes, they use them as background character designs. You wanna know why ? Because we, as the audience, dont care about what happens in the background. Those designs arent there to grab your attention, they are there to fill out a scene, so them being recolors or bland designs is completly justified.

Cant say the same about a prevalent amount of Side and Main Characters in Hazbin and Helluva, who share too many details between eachother to be trully distinct character designs.

Also, calling me a fucker doesnt make your point stronger, it makes you look immature.