Other times it is users trying to interact with your account in the hope that you then check out the user that liked the track, then listen to their music / follow them etc, for this they use software like “soundcloudmanager”
As mentioned above, other times it is just to boost followers to a fake account (by using a pretty girl, come on guys we know this works lol), then these fake accounts will repost a track and it will be syndicated to the streams of all followers