AlumoAudio saidwow, you have communicative users :) probably it depend of type of music :) i also found, that someone added my track's through audioswap, or other adrev service,But this is just an additional feature ‘on the side’ and it’s there for YT users to use if they need it. Also, users can use it to find specific tracks, just by typing in the song name or artist.
For example, I’m aware of many users that have used it to overlay my own music on their non-monetized videos, that didn’t contain any music to begin with. Other YouTubers then hear this music and will often ask in the comments where the music is from. So it’s all part of getting our music out there and heard on YouTube.
then i try to friendly torture that user by asking them, from where he take's this track, he was completely silent, and not speak at all, :)