Before we look at the solutions, we have to understand the brick wall. The Nintendo 3DS runs on a 268MHz ARM11 processor (boosted to 804MHz in the "New" 3DS models) with a paltry 128MB of RAM (256MB for the "New" models). For context, the Spotify app on your phone requires about 50-100MB of RAM just to sit idle .
Given the technological landscape in 2024, a native Spotify client for the 3DS will never happen—for three concrete reasons: spotify 3ds homebrew