Deafness covers a broad spectrum of hearing difficulty, not just completely deaf. Most people that identify as deaf still have some hearing. I always forget that and had the same question as you until I read a comment further down.
It’s likely that the person isn’t fully deaf and so can still hear some music, but deaf enough that they can’t understand the lyrics. Having the ability to view the lyrics in real time is handy rather than having to search them up all the time. Spotify also shows what lyric is currently being sung in real time, whereas you can’t get that with a Google search.
Deafness covers a broad spectrum of hearing difficulty, not just completely deaf. Most people that identify as deaf still have some hearing. I always forget that and had the same question as you until I read a comment further down.
It’s likely that the person isn’t fully deaf and so can still hear some music, but deaf enough that they can’t understand the lyrics. Having the ability to view the lyrics in real time is handy rather than having to search them up all the time. Spotify also shows what lyric is currently being sung in real time, whereas you can’t get that with a Google search.